diff --git a/Jupyter_notebooks/2.1-create_nes_port.ipynb b/Jupyter_notebooks/2.1-create_nes_port.ipynb
index f5765cab0e9c57ba13717d5a6fafb2184e8e85b7..77e90d6cc96a8632f6dd8bb6f7e46594ff17a3c1 100644
--- a/Jupyter_notebooks/2.1-create_nes_port.ipynb
+++ b/Jupyter_notebooks/2.1-create_nes_port.ipynb
@@ -368,9 +368,9 @@
     "metadata = {'station_name': {'data': df_data.columns[2:4].to_numpy(),\n",
     "                             'dimensions': ('station',),\n",
     "                             'dtype': str},\n",
-    "            'NO2': {'data': df_data.iloc[:, 2:4].to_numpy(),\n",
-    "                    'dimensions': ('time', 'station',),\n",
-    "                    'dtype': float}}"
+    "            'sconcno2': {'data': df_data.iloc[:, 2:4].to_numpy(),\n",
+    "                         'dimensions': ('time', 'station',),\n",
+    "                         'dtype': float}}"
    ]
   },
   {
@@ -408,8 +408,8 @@
       "Rank 000: Var station_name created (1/2)\n",
       "Rank 000: Var station_name data (1/2)\n",
       "Rank 000: Var station_name completed (1/2)\n",
-      "Rank 000: Writing NO2 var (2/2)\n",
-      "Rank 000: Var NO2 created (2/2)\n"
+      "Rank 000: Writing sconcno2 var (2/2)\n",
+      "Rank 000: Var sconcno2 created (2/2)\n"
      ]
     },
     {
@@ -424,8 +424,8 @@
      "name": "stdout",
      "output_type": "stream",
      "text": [
-      "Rank 000: Var NO2 data (2/2)\n",
-      "Rank 000: Var NO2 completed (2/2)\n"
+      "Rank 000: Var sconcno2 data (2/2)\n",
+      "Rank 000: Var sconcno2 completed (2/2)\n"
      ]
     }
    ],
@@ -800,20 +800,20 @@
        "  * station       (station) float64 0.0 1.0\n",
        "Data variables:\n",
        "    station_name  (station) object 'NO2-UM' 'NO2-ZAL Prat'\n",
-       "    NO2           (time, station) float64 63.38 46.01 64.64 ... 12.76 28.66\n",
+       "    sconcno2      (time, station) float64 63.38 46.01 64.64 ... 12.76 28.66\n",
        "    lat           (station) float64 41.37 41.32\n",
        "    lon           (station) float64 2.185 2.135\n",
        "Attributes:\n",
-       "    Conventions:  CF-1.7</pre><div class='xr-wrap' hidden><div class='xr-header'><div class='xr-obj-type'>xarray.Dataset</div></div><ul class='xr-sections'><li class='xr-section-item'><input id='section-8b745205-869a-41cf-8968-75eff4a8065b' class='xr-section-summary-in' type='checkbox' disabled ><label for='section-8b745205-869a-41cf-8968-75eff4a8065b' class='xr-section-summary'  title='Expand/collapse section'>Dimensions:</label><div class='xr-section-inline-details'><ul class='xr-dim-list'><li><span class='xr-has-index'>time</span>: 43819</li><li><span class='xr-has-index'>station</span>: 2</li></ul></div><div class='xr-section-details'></div></li><li class='xr-section-item'><input id='section-7e79e3e9-703f-46e7-8765-19ce8f15d4e0' class='xr-section-summary-in' type='checkbox'  checked><label for='section-7e79e3e9-703f-46e7-8765-19ce8f15d4e0' class='xr-section-summary' >Coordinates: <span>(2)</span></label><div class='xr-section-inline-details'></div><div class='xr-section-details'><ul class='xr-var-list'><li class='xr-var-item'><div class='xr-var-name'><span class='xr-has-index'>time</span></div><div class='xr-var-dims'>(time)</div><div class='xr-var-dtype'>datetime64[ns]</div><div class='xr-var-preview xr-preview'>2017-01-01 ... 2021-12-31T18:00:00</div><input id='attrs-6300759c-057b-4c9f-ae69-cf27e475d5f5' class='xr-var-attrs-in' type='checkbox' ><label for='attrs-6300759c-057b-4c9f-ae69-cf27e475d5f5' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-f94d34b8-c2e5-43a2-be2d-c028909ebec3' class='xr-var-data-in' type='checkbox'><label for='data-f94d34b8-c2e5-43a2-be2d-c028909ebec3' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'><dt><span>standard_name :</span></dt><dd>time</dd><dt><span>long_name :</span></dt><dd>time</dd></dl></div><div class='xr-var-data'><pre>array([&#x27;2017-01-01T00:00:00.000000000&#x27;, &#x27;2017-01-01T01:00:00.000000000&#x27;,\n",
+       "    Conventions:  CF-1.7</pre><div class='xr-wrap' hidden><div class='xr-header'><div class='xr-obj-type'>xarray.Dataset</div></div><ul class='xr-sections'><li class='xr-section-item'><input id='section-7a5f2cc1-f011-42cc-9f01-7dc45f2752d4' class='xr-section-summary-in' type='checkbox' disabled ><label for='section-7a5f2cc1-f011-42cc-9f01-7dc45f2752d4' class='xr-section-summary'  title='Expand/collapse section'>Dimensions:</label><div class='xr-section-inline-details'><ul class='xr-dim-list'><li><span class='xr-has-index'>time</span>: 43819</li><li><span class='xr-has-index'>station</span>: 2</li></ul></div><div class='xr-section-details'></div></li><li class='xr-section-item'><input id='section-4756d36c-da19-40aa-8ead-951748fdd7f3' class='xr-section-summary-in' type='checkbox'  checked><label for='section-4756d36c-da19-40aa-8ead-951748fdd7f3' class='xr-section-summary' >Coordinates: <span>(2)</span></label><div class='xr-section-inline-details'></div><div class='xr-section-details'><ul class='xr-var-list'><li class='xr-var-item'><div class='xr-var-name'><span class='xr-has-index'>time</span></div><div class='xr-var-dims'>(time)</div><div class='xr-var-dtype'>datetime64[ns]</div><div class='xr-var-preview xr-preview'>2017-01-01 ... 2021-12-31T18:00:00</div><input id='attrs-8fc9a49e-2d86-4627-b26a-371b207ef85d' class='xr-var-attrs-in' type='checkbox' ><label for='attrs-8fc9a49e-2d86-4627-b26a-371b207ef85d' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-b806bff5-0eec-486f-8da1-144424932c89' class='xr-var-data-in' type='checkbox'><label for='data-b806bff5-0eec-486f-8da1-144424932c89' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'><dt><span>standard_name :</span></dt><dd>time</dd><dt><span>long_name :</span></dt><dd>time</dd></dl></div><div class='xr-var-data'><pre>array([&#x27;2017-01-01T00:00:00.000000000&#x27;, &#x27;2017-01-01T01:00:00.000000000&#x27;,\n",
        "       &#x27;2017-01-01T02:00:00.000000000&#x27;, ..., &#x27;2021-12-31T16:00:00.000000000&#x27;,\n",
        "       &#x27;2021-12-31T17:00:00.000000000&#x27;, &#x27;2021-12-31T18:00:00.000000000&#x27;],\n",
-       "      dtype=&#x27;datetime64[ns]&#x27;)</pre></div></li><li class='xr-var-item'><div class='xr-var-name'><span class='xr-has-index'>station</span></div><div class='xr-var-dims'>(station)</div><div class='xr-var-dtype'>float64</div><div class='xr-var-preview xr-preview'>0.0 1.0</div><input id='attrs-c95417f5-3ac9-4d29-91c3-0e15261ae025' class='xr-var-attrs-in' type='checkbox' ><label for='attrs-c95417f5-3ac9-4d29-91c3-0e15261ae025' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-0d9b90c4-2d34-4abc-84b2-8e687f96c4a8' class='xr-var-data-in' type='checkbox'><label for='data-0d9b90c4-2d34-4abc-84b2-8e687f96c4a8' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'><dt><span>units :</span></dt><dd></dd><dt><span>axis :</span></dt><dd>X</dd><dt><span>long_name :</span></dt><dd></dd><dt><span>standard_name :</span></dt><dd>station</dd></dl></div><div class='xr-var-data'><pre>array([0., 1.])</pre></div></li></ul></div></li><li class='xr-section-item'><input id='section-b614fe80-bd01-49a5-8302-be75927ebaa4' class='xr-section-summary-in' type='checkbox'  checked><label for='section-b614fe80-bd01-49a5-8302-be75927ebaa4' class='xr-section-summary' >Data variables: <span>(4)</span></label><div class='xr-section-inline-details'></div><div class='xr-section-details'><ul class='xr-var-list'><li class='xr-var-item'><div class='xr-var-name'><span>station_name</span></div><div class='xr-var-dims'>(station)</div><div class='xr-var-dtype'>object</div><div class='xr-var-preview xr-preview'>...</div><input id='attrs-c8121d5f-ae31-4dd0-8039-d471f9540ca1' class='xr-var-attrs-in' type='checkbox' disabled><label for='attrs-c8121d5f-ae31-4dd0-8039-d471f9540ca1' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-5257192b-376e-4394-8c4a-9c333db209a1' class='xr-var-data-in' type='checkbox'><label for='data-5257192b-376e-4394-8c4a-9c333db209a1' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'></dl></div><div class='xr-var-data'><pre>array([&#x27;NO2-UM&#x27;, &#x27;NO2-ZAL Prat&#x27;], dtype=object)</pre></div></li><li class='xr-var-item'><div class='xr-var-name'><span>NO2</span></div><div class='xr-var-dims'>(time, station)</div><div class='xr-var-dtype'>float64</div><div class='xr-var-preview xr-preview'>...</div><input id='attrs-79912914-c2bb-4fae-a60f-b81f9f44b841' class='xr-var-attrs-in' type='checkbox' disabled><label for='attrs-79912914-c2bb-4fae-a60f-b81f9f44b841' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-5470d2a2-3753-42fe-98f3-48bcd0b12672' class='xr-var-data-in' type='checkbox'><label for='data-5470d2a2-3753-42fe-98f3-48bcd0b12672' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'></dl></div><div class='xr-var-data'><pre>array([[63.38, 46.01],\n",
+       "      dtype=&#x27;datetime64[ns]&#x27;)</pre></div></li><li class='xr-var-item'><div class='xr-var-name'><span class='xr-has-index'>station</span></div><div class='xr-var-dims'>(station)</div><div class='xr-var-dtype'>float64</div><div class='xr-var-preview xr-preview'>0.0 1.0</div><input id='attrs-c283f997-a3c4-4ce0-b28b-7b84ca0ae01c' class='xr-var-attrs-in' type='checkbox' ><label for='attrs-c283f997-a3c4-4ce0-b28b-7b84ca0ae01c' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-a9a68f5b-c436-4a54-ba82-ca88bfd4c029' class='xr-var-data-in' type='checkbox'><label for='data-a9a68f5b-c436-4a54-ba82-ca88bfd4c029' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'><dt><span>units :</span></dt><dd></dd><dt><span>axis :</span></dt><dd>X</dd><dt><span>long_name :</span></dt><dd></dd><dt><span>standard_name :</span></dt><dd>station</dd></dl></div><div class='xr-var-data'><pre>array([0., 1.])</pre></div></li></ul></div></li><li class='xr-section-item'><input id='section-400a8e82-2ba4-47d2-be09-1893e8ac956a' class='xr-section-summary-in' type='checkbox'  checked><label for='section-400a8e82-2ba4-47d2-be09-1893e8ac956a' class='xr-section-summary' >Data variables: <span>(4)</span></label><div class='xr-section-inline-details'></div><div class='xr-section-details'><ul class='xr-var-list'><li class='xr-var-item'><div class='xr-var-name'><span>station_name</span></div><div class='xr-var-dims'>(station)</div><div class='xr-var-dtype'>object</div><div class='xr-var-preview xr-preview'>...</div><input id='attrs-6ae186e2-6bc2-4034-8944-cd5d34755164' class='xr-var-attrs-in' type='checkbox' disabled><label for='attrs-6ae186e2-6bc2-4034-8944-cd5d34755164' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-4880a70f-23b8-48c1-ba2a-68447c82d44d' class='xr-var-data-in' type='checkbox'><label for='data-4880a70f-23b8-48c1-ba2a-68447c82d44d' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'></dl></div><div class='xr-var-data'><pre>array([&#x27;NO2-UM&#x27;, &#x27;NO2-ZAL Prat&#x27;], dtype=object)</pre></div></li><li class='xr-var-item'><div class='xr-var-name'><span>sconcno2</span></div><div class='xr-var-dims'>(time, station)</div><div class='xr-var-dtype'>float64</div><div class='xr-var-preview xr-preview'>...</div><input id='attrs-26cdf929-514e-4b36-bfc4-40a7c8f83850' class='xr-var-attrs-in' type='checkbox' disabled><label for='attrs-26cdf929-514e-4b36-bfc4-40a7c8f83850' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-2b7c7114-ea9b-4eb7-8efa-8c1f51b677f9' class='xr-var-data-in' type='checkbox'><label for='data-2b7c7114-ea9b-4eb7-8efa-8c1f51b677f9' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'></dl></div><div class='xr-var-data'><pre>array([[63.38, 46.01],\n",
        "       [64.64, 49.08],\n",
        "       [68.16, 53.  ],\n",
        "       ...,\n",
        "       [29.1 , 25.79],\n",
        "       [ 9.24, 29.82],\n",
-       "       [12.76, 28.66]])</pre></div></li><li class='xr-var-item'><div class='xr-var-name'><span>lat</span></div><div class='xr-var-dims'>(station)</div><div class='xr-var-dtype'>float64</div><div class='xr-var-preview xr-preview'>...</div><input id='attrs-2f25c276-5870-4bc3-8ac1-38a2a3dc2a52' class='xr-var-attrs-in' type='checkbox' ><label for='attrs-2f25c276-5870-4bc3-8ac1-38a2a3dc2a52' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-aa6bfd03-8791-4ab1-9f3c-a5ae16c81338' class='xr-var-data-in' type='checkbox'><label for='data-aa6bfd03-8791-4ab1-9f3c-a5ae16c81338' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'><dt><span>units :</span></dt><dd>degrees_north</dd><dt><span>axis :</span></dt><dd>Y</dd><dt><span>long_name :</span></dt><dd>latitude coordinate</dd><dt><span>standard_name :</span></dt><dd>latitude</dd></dl></div><div class='xr-var-data'><pre>array([41.373777, 41.317277])</pre></div></li><li class='xr-var-item'><div class='xr-var-name'><span>lon</span></div><div class='xr-var-dims'>(station)</div><div class='xr-var-dtype'>float64</div><div class='xr-var-preview xr-preview'>...</div><input id='attrs-5b634ab3-72ae-4b17-b39b-a9639ad6bcae' class='xr-var-attrs-in' type='checkbox' ><label for='attrs-5b634ab3-72ae-4b17-b39b-a9639ad6bcae' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-f69b8301-5a93-4e43-ac4e-8db57476db1d' class='xr-var-data-in' type='checkbox'><label for='data-f69b8301-5a93-4e43-ac4e-8db57476db1d' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'><dt><span>units :</span></dt><dd>degrees_east</dd><dt><span>axis :</span></dt><dd>X</dd><dt><span>long_name :</span></dt><dd>longitude coordinate</dd><dt><span>standard_name :</span></dt><dd>longitude</dd></dl></div><div class='xr-var-data'><pre>array([2.184514, 2.134501])</pre></div></li></ul></div></li><li class='xr-section-item'><input id='section-89189988-9563-4f07-b5dc-cf44f0462758' class='xr-section-summary-in' type='checkbox'  checked><label for='section-89189988-9563-4f07-b5dc-cf44f0462758' class='xr-section-summary' >Attributes: <span>(1)</span></label><div class='xr-section-inline-details'></div><div class='xr-section-details'><dl class='xr-attrs'><dt><span>Conventions :</span></dt><dd>CF-1.7</dd></dl></div></li></ul></div></div>"
+       "       [12.76, 28.66]])</pre></div></li><li class='xr-var-item'><div class='xr-var-name'><span>lat</span></div><div class='xr-var-dims'>(station)</div><div class='xr-var-dtype'>float64</div><div class='xr-var-preview xr-preview'>...</div><input id='attrs-973e3fde-f87f-478b-8cb3-3c47b7735c67' class='xr-var-attrs-in' type='checkbox' ><label for='attrs-973e3fde-f87f-478b-8cb3-3c47b7735c67' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-23758d87-a923-4ab2-aeb9-20bdab75664b' class='xr-var-data-in' type='checkbox'><label for='data-23758d87-a923-4ab2-aeb9-20bdab75664b' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'><dt><span>units :</span></dt><dd>degrees_north</dd><dt><span>axis :</span></dt><dd>Y</dd><dt><span>long_name :</span></dt><dd>latitude coordinate</dd><dt><span>standard_name :</span></dt><dd>latitude</dd></dl></div><div class='xr-var-data'><pre>array([41.373777, 41.317277])</pre></div></li><li class='xr-var-item'><div class='xr-var-name'><span>lon</span></div><div class='xr-var-dims'>(station)</div><div class='xr-var-dtype'>float64</div><div class='xr-var-preview xr-preview'>...</div><input id='attrs-ba9ec9cf-8942-4c89-996c-868ea23e63b4' class='xr-var-attrs-in' type='checkbox' ><label for='attrs-ba9ec9cf-8942-4c89-996c-868ea23e63b4' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-a525aecd-afde-4ab9-9b0e-8f525c1e6636' class='xr-var-data-in' type='checkbox'><label for='data-a525aecd-afde-4ab9-9b0e-8f525c1e6636' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'><dt><span>units :</span></dt><dd>degrees_east</dd><dt><span>axis :</span></dt><dd>X</dd><dt><span>long_name :</span></dt><dd>longitude coordinate</dd><dt><span>standard_name :</span></dt><dd>longitude</dd></dl></div><div class='xr-var-data'><pre>array([2.184514, 2.134501])</pre></div></li></ul></div></li><li class='xr-section-item'><input id='section-116d9d67-0444-4117-96b8-79e72b773eb9' class='xr-section-summary-in' type='checkbox'  checked><label for='section-116d9d67-0444-4117-96b8-79e72b773eb9' class='xr-section-summary' >Attributes: <span>(1)</span></label><div class='xr-section-inline-details'></div><div class='xr-section-details'><dl class='xr-attrs'><dt><span>Conventions :</span></dt><dd>CF-1.7</dd></dl></div></li></ul></div></div>"
       ],
       "text/plain": [
        "<xarray.Dataset>\n",
@@ -823,7 +823,7 @@
        "  * station       (station) float64 0.0 1.0\n",
        "Data variables:\n",
        "    station_name  (station) object ...\n",
-       "    NO2           (time, station) float64 ...\n",
+       "    sconcno2      (time, station) float64 ...\n",
        "    lat           (station) float64 ...\n",
        "    lon           (station) float64 ...\n",
        "Attributes:\n",
@@ -1106,11 +1106,19 @@
     "    # Read time\n",
     "    time = current.index.to_pydatetime()\n",
     "    \n",
+    "    # Fill altitude with nans\n",
+    "    altitude = np.full(len(current.columns[2:4]), np.nan)\n",
+    "    \n",
     "    # Read metadata\n",
     "    metadata = {'station_name': {'data': station_name,\n",
     "                                 'dimensions': ('station', 'strlen'),\n",
     "                                 'standard_name': '',\n",
     "                                 'dtype': 'S1'},\n",
+    "                'altitude': {'data': altitude,\n",
+    "                             'dimensions': ('station',),\n",
+    "                             'units': 'meters',\n",
+    "                             'standard_name': 'altitude',\n",
+    "                             'dtype': float},\n",
     "                'sconcno2': {'data': current.iloc[:, 2:4].to_numpy(),\n",
     "                             'units': 'µg m-3',\n",
     "                             'dimensions': ('time', 'station',),\n",
@@ -1497,20 +1505,21 @@
        "  * station       (station) float64 0.0 1.0\n",
        "Data variables:\n",
        "    station_name  (station) |S75 b&#x27;NO2-UM&#x27; b&#x27;NO2-ZAL Prat&#x27;\n",
+       "    altitude      (station) float64 nan nan\n",
        "    sconcno2      (time, station) float64 6.88 23.03 8.77 ... 26.42 0.07 27.11\n",
        "    lat           (station) float64 41.37 41.32\n",
        "    lon           (station) float64 2.185 2.135\n",
        "Attributes:\n",
-       "    Conventions:  CF-1.7</pre><div class='xr-wrap' hidden><div class='xr-header'><div class='xr-obj-type'>xarray.Dataset</div></div><ul class='xr-sections'><li class='xr-section-item'><input id='section-b42c7ebb-5785-4d07-b45c-9f55fe4840fa' class='xr-section-summary-in' type='checkbox' disabled ><label for='section-b42c7ebb-5785-4d07-b45c-9f55fe4840fa' class='xr-section-summary'  title='Expand/collapse section'>Dimensions:</label><div class='xr-section-inline-details'><ul class='xr-dim-list'><li><span class='xr-has-index'>time</span>: 744</li><li><span class='xr-has-index'>station</span>: 2</li></ul></div><div class='xr-section-details'></div></li><li class='xr-section-item'><input id='section-bef46fdc-61b8-4dd2-8e2b-348a18a03644' class='xr-section-summary-in' type='checkbox'  checked><label for='section-bef46fdc-61b8-4dd2-8e2b-348a18a03644' class='xr-section-summary' >Coordinates: <span>(2)</span></label><div class='xr-section-inline-details'></div><div class='xr-section-details'><ul class='xr-var-list'><li class='xr-var-item'><div class='xr-var-name'><span class='xr-has-index'>time</span></div><div class='xr-var-dims'>(time)</div><div class='xr-var-dtype'>datetime64[ns]</div><div class='xr-var-preview xr-preview'>2017-05-01 ... 2017-05-31T23:00:00</div><input id='attrs-d782b002-bba7-4d74-bfad-c9b916d2a92c' class='xr-var-attrs-in' type='checkbox' ><label for='attrs-d782b002-bba7-4d74-bfad-c9b916d2a92c' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-4286f4bf-e537-42a1-aaf5-648006255195' class='xr-var-data-in' type='checkbox'><label for='data-4286f4bf-e537-42a1-aaf5-648006255195' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'><dt><span>standard_name :</span></dt><dd>time</dd><dt><span>long_name :</span></dt><dd>time</dd></dl></div><div class='xr-var-data'><pre>array([&#x27;2017-05-01T00:00:00.000000000&#x27;, &#x27;2017-05-01T01:00:00.000000000&#x27;,\n",
+       "    Conventions:  CF-1.7</pre><div class='xr-wrap' hidden><div class='xr-header'><div class='xr-obj-type'>xarray.Dataset</div></div><ul class='xr-sections'><li class='xr-section-item'><input id='section-c83031ab-5cb5-4344-9ad9-7a2d6b9290dd' class='xr-section-summary-in' type='checkbox' disabled ><label for='section-c83031ab-5cb5-4344-9ad9-7a2d6b9290dd' class='xr-section-summary'  title='Expand/collapse section'>Dimensions:</label><div class='xr-section-inline-details'><ul class='xr-dim-list'><li><span class='xr-has-index'>time</span>: 744</li><li><span class='xr-has-index'>station</span>: 2</li></ul></div><div class='xr-section-details'></div></li><li class='xr-section-item'><input id='section-8255d696-fb47-4b6b-8d99-3bf234044086' class='xr-section-summary-in' type='checkbox'  checked><label for='section-8255d696-fb47-4b6b-8d99-3bf234044086' class='xr-section-summary' >Coordinates: <span>(2)</span></label><div class='xr-section-inline-details'></div><div class='xr-section-details'><ul class='xr-var-list'><li class='xr-var-item'><div class='xr-var-name'><span class='xr-has-index'>time</span></div><div class='xr-var-dims'>(time)</div><div class='xr-var-dtype'>datetime64[ns]</div><div class='xr-var-preview xr-preview'>2017-05-01 ... 2017-05-31T23:00:00</div><input id='attrs-19d19bcc-c96c-4625-b0e0-b9de21411eee' class='xr-var-attrs-in' type='checkbox' ><label for='attrs-19d19bcc-c96c-4625-b0e0-b9de21411eee' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-50821d71-93dc-473f-a1d1-e7fe923818a1' class='xr-var-data-in' type='checkbox'><label for='data-50821d71-93dc-473f-a1d1-e7fe923818a1' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'><dt><span>standard_name :</span></dt><dd>time</dd><dt><span>long_name :</span></dt><dd>time</dd></dl></div><div class='xr-var-data'><pre>array([&#x27;2017-05-01T00:00:00.000000000&#x27;, &#x27;2017-05-01T01:00:00.000000000&#x27;,\n",
        "       &#x27;2017-05-01T02:00:00.000000000&#x27;, ..., &#x27;2017-05-31T21:00:00.000000000&#x27;,\n",
        "       &#x27;2017-05-31T22:00:00.000000000&#x27;, &#x27;2017-05-31T23:00:00.000000000&#x27;],\n",
-       "      dtype=&#x27;datetime64[ns]&#x27;)</pre></div></li><li class='xr-var-item'><div class='xr-var-name'><span class='xr-has-index'>station</span></div><div class='xr-var-dims'>(station)</div><div class='xr-var-dtype'>float64</div><div class='xr-var-preview xr-preview'>0.0 1.0</div><input id='attrs-764a122a-79c3-4977-9864-805be257a35f' class='xr-var-attrs-in' type='checkbox' ><label for='attrs-764a122a-79c3-4977-9864-805be257a35f' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-496f10f2-8d4f-4693-8d4c-85c86e9e3464' class='xr-var-data-in' type='checkbox'><label for='data-496f10f2-8d4f-4693-8d4c-85c86e9e3464' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'><dt><span>units :</span></dt><dd></dd><dt><span>axis :</span></dt><dd>X</dd><dt><span>long_name :</span></dt><dd></dd><dt><span>standard_name :</span></dt><dd>station</dd></dl></div><div class='xr-var-data'><pre>array([0., 1.])</pre></div></li></ul></div></li><li class='xr-section-item'><input id='section-62bd610c-5210-4df7-a7a3-38ab05866b0f' class='xr-section-summary-in' type='checkbox'  checked><label for='section-62bd610c-5210-4df7-a7a3-38ab05866b0f' class='xr-section-summary' >Data variables: <span>(4)</span></label><div class='xr-section-inline-details'></div><div class='xr-section-details'><ul class='xr-var-list'><li class='xr-var-item'><div class='xr-var-name'><span>station_name</span></div><div class='xr-var-dims'>(station)</div><div class='xr-var-dtype'>|S75</div><div class='xr-var-preview xr-preview'>...</div><input id='attrs-452ab3b5-7c06-4506-ac5d-de565aaafa24' class='xr-var-attrs-in' type='checkbox' ><label for='attrs-452ab3b5-7c06-4506-ac5d-de565aaafa24' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-638a250c-4c2a-477b-8875-72b44c43f6ef' class='xr-var-data-in' type='checkbox'><label for='data-638a250c-4c2a-477b-8875-72b44c43f6ef' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'><dt><span>standard_name :</span></dt><dd></dd></dl></div><div class='xr-var-data'><pre>array([b&#x27;NO2-UM&#x27;, b&#x27;NO2-ZAL Prat&#x27;], dtype=&#x27;|S75&#x27;)</pre></div></li><li class='xr-var-item'><div class='xr-var-name'><span>sconcno2</span></div><div class='xr-var-dims'>(time, station)</div><div class='xr-var-dtype'>float64</div><div class='xr-var-preview xr-preview'>...</div><input id='attrs-6413050e-bd0d-40ab-9cc1-2608f31ac011' class='xr-var-attrs-in' type='checkbox' ><label for='attrs-6413050e-bd0d-40ab-9cc1-2608f31ac011' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-662951cb-7393-475a-99a9-c693a841d369' class='xr-var-data-in' type='checkbox'><label for='data-662951cb-7393-475a-99a9-c693a841d369' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'><dt><span>units :</span></dt><dd>µg m-3</dd><dt><span>long_name :</span></dt><dd></dd></dl></div><div class='xr-var-data'><pre>array([[ 6.88, 23.03],\n",
+       "      dtype=&#x27;datetime64[ns]&#x27;)</pre></div></li><li class='xr-var-item'><div class='xr-var-name'><span class='xr-has-index'>station</span></div><div class='xr-var-dims'>(station)</div><div class='xr-var-dtype'>float64</div><div class='xr-var-preview xr-preview'>0.0 1.0</div><input id='attrs-62e3b4c8-6003-4914-9edc-da613fdf69da' class='xr-var-attrs-in' type='checkbox' ><label for='attrs-62e3b4c8-6003-4914-9edc-da613fdf69da' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-371f6272-8f2c-4c50-a4b7-8a87bc0d4286' class='xr-var-data-in' type='checkbox'><label for='data-371f6272-8f2c-4c50-a4b7-8a87bc0d4286' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'><dt><span>units :</span></dt><dd></dd><dt><span>axis :</span></dt><dd>X</dd><dt><span>long_name :</span></dt><dd></dd><dt><span>standard_name :</span></dt><dd>station</dd></dl></div><div class='xr-var-data'><pre>array([0., 1.])</pre></div></li></ul></div></li><li class='xr-section-item'><input id='section-514dfcb9-139a-4abf-ae51-4f14e1e2d478' class='xr-section-summary-in' type='checkbox'  checked><label for='section-514dfcb9-139a-4abf-ae51-4f14e1e2d478' class='xr-section-summary' >Data variables: <span>(5)</span></label><div class='xr-section-inline-details'></div><div class='xr-section-details'><ul class='xr-var-list'><li class='xr-var-item'><div class='xr-var-name'><span>station_name</span></div><div class='xr-var-dims'>(station)</div><div class='xr-var-dtype'>|S75</div><div class='xr-var-preview xr-preview'>...</div><input id='attrs-eda4e9c1-91c9-4655-ab54-d742a921601f' class='xr-var-attrs-in' type='checkbox' ><label for='attrs-eda4e9c1-91c9-4655-ab54-d742a921601f' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-f1df6980-9117-4b2c-95e9-45c15b1dca05' class='xr-var-data-in' type='checkbox'><label for='data-f1df6980-9117-4b2c-95e9-45c15b1dca05' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'><dt><span>standard_name :</span></dt><dd></dd></dl></div><div class='xr-var-data'><pre>array([b&#x27;NO2-UM&#x27;, b&#x27;NO2-ZAL Prat&#x27;], dtype=&#x27;|S75&#x27;)</pre></div></li><li class='xr-var-item'><div class='xr-var-name'><span>altitude</span></div><div class='xr-var-dims'>(station)</div><div class='xr-var-dtype'>float64</div><div class='xr-var-preview xr-preview'>...</div><input id='attrs-b3862db2-b7cf-41f6-b751-1aae730cfdd8' class='xr-var-attrs-in' type='checkbox' ><label for='attrs-b3862db2-b7cf-41f6-b751-1aae730cfdd8' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-f6deb3d7-9aba-439f-a9eb-ec8aaf20183c' class='xr-var-data-in' type='checkbox'><label for='data-f6deb3d7-9aba-439f-a9eb-ec8aaf20183c' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'><dt><span>units :</span></dt><dd>meters</dd><dt><span>standard_name :</span></dt><dd>altitude</dd></dl></div><div class='xr-var-data'><pre>array([nan, nan])</pre></div></li><li class='xr-var-item'><div class='xr-var-name'><span>sconcno2</span></div><div class='xr-var-dims'>(time, station)</div><div class='xr-var-dtype'>float64</div><div class='xr-var-preview xr-preview'>...</div><input id='attrs-a59ddf5c-d4a7-4f15-8ecc-e963a7e2fb93' class='xr-var-attrs-in' type='checkbox' ><label for='attrs-a59ddf5c-d4a7-4f15-8ecc-e963a7e2fb93' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-dc360e26-ca73-44d1-9e15-3890adb8f71e' class='xr-var-data-in' type='checkbox'><label for='data-dc360e26-ca73-44d1-9e15-3890adb8f71e' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'><dt><span>units :</span></dt><dd>µg m-3</dd><dt><span>long_name :</span></dt><dd></dd></dl></div><div class='xr-var-data'><pre>array([[ 6.88, 23.03],\n",
        "       [ 8.77, 23.49],\n",
        "       [ 1.76, 21.73],\n",
        "       ...,\n",
        "       [21.96, 41.2 ],\n",
        "       [ 0.  , 26.42],\n",
-       "       [ 0.07, 27.11]])</pre></div></li><li class='xr-var-item'><div class='xr-var-name'><span>lat</span></div><div class='xr-var-dims'>(station)</div><div class='xr-var-dtype'>float64</div><div class='xr-var-preview xr-preview'>...</div><input id='attrs-58c8bc50-b7c5-4848-8a67-a5f39fffd093' class='xr-var-attrs-in' type='checkbox' ><label for='attrs-58c8bc50-b7c5-4848-8a67-a5f39fffd093' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-a398ab93-0ac2-473f-a8a7-7e4be7695a33' class='xr-var-data-in' type='checkbox'><label for='data-a398ab93-0ac2-473f-a8a7-7e4be7695a33' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'><dt><span>units :</span></dt><dd>degrees_north</dd><dt><span>axis :</span></dt><dd>Y</dd><dt><span>long_name :</span></dt><dd>latitude coordinate</dd><dt><span>standard_name :</span></dt><dd>latitude</dd></dl></div><div class='xr-var-data'><pre>array([41.373777, 41.317277])</pre></div></li><li class='xr-var-item'><div class='xr-var-name'><span>lon</span></div><div class='xr-var-dims'>(station)</div><div class='xr-var-dtype'>float64</div><div class='xr-var-preview xr-preview'>...</div><input id='attrs-82b11d27-836c-4b04-9e8f-9ee7959c0818' class='xr-var-attrs-in' type='checkbox' ><label for='attrs-82b11d27-836c-4b04-9e8f-9ee7959c0818' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-87b605d9-91e6-4155-8407-5fd1ef3d4825' class='xr-var-data-in' type='checkbox'><label for='data-87b605d9-91e6-4155-8407-5fd1ef3d4825' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'><dt><span>units :</span></dt><dd>degrees_east</dd><dt><span>axis :</span></dt><dd>X</dd><dt><span>long_name :</span></dt><dd>longitude coordinate</dd><dt><span>standard_name :</span></dt><dd>longitude</dd></dl></div><div class='xr-var-data'><pre>array([2.184514, 2.134501])</pre></div></li></ul></div></li><li class='xr-section-item'><input id='section-27f2f67c-eee7-4019-a12c-cb4a5543d982' class='xr-section-summary-in' type='checkbox'  checked><label for='section-27f2f67c-eee7-4019-a12c-cb4a5543d982' class='xr-section-summary' >Attributes: <span>(1)</span></label><div class='xr-section-inline-details'></div><div class='xr-section-details'><dl class='xr-attrs'><dt><span>Conventions :</span></dt><dd>CF-1.7</dd></dl></div></li></ul></div></div>"
+       "       [ 0.07, 27.11]])</pre></div></li><li class='xr-var-item'><div class='xr-var-name'><span>lat</span></div><div class='xr-var-dims'>(station)</div><div class='xr-var-dtype'>float64</div><div class='xr-var-preview xr-preview'>...</div><input id='attrs-257670d6-abd5-4263-b969-150013441088' class='xr-var-attrs-in' type='checkbox' ><label for='attrs-257670d6-abd5-4263-b969-150013441088' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-55135475-c03f-49a0-98f6-8838bdec2fb2' class='xr-var-data-in' type='checkbox'><label for='data-55135475-c03f-49a0-98f6-8838bdec2fb2' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'><dt><span>units :</span></dt><dd>degrees_north</dd><dt><span>axis :</span></dt><dd>Y</dd><dt><span>long_name :</span></dt><dd>latitude coordinate</dd><dt><span>standard_name :</span></dt><dd>latitude</dd></dl></div><div class='xr-var-data'><pre>array([41.373777, 41.317277])</pre></div></li><li class='xr-var-item'><div class='xr-var-name'><span>lon</span></div><div class='xr-var-dims'>(station)</div><div class='xr-var-dtype'>float64</div><div class='xr-var-preview xr-preview'>...</div><input id='attrs-6044f378-547f-488d-8462-a65ace659dab' class='xr-var-attrs-in' type='checkbox' ><label for='attrs-6044f378-547f-488d-8462-a65ace659dab' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-57030515-daf9-4d78-bfc1-62d409e7ca47' class='xr-var-data-in' type='checkbox'><label for='data-57030515-daf9-4d78-bfc1-62d409e7ca47' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'><dt><span>units :</span></dt><dd>degrees_east</dd><dt><span>axis :</span></dt><dd>X</dd><dt><span>long_name :</span></dt><dd>longitude coordinate</dd><dt><span>standard_name :</span></dt><dd>longitude</dd></dl></div><div class='xr-var-data'><pre>array([2.184514, 2.134501])</pre></div></li></ul></div></li><li class='xr-section-item'><input id='section-118bf7cd-2642-40c3-b1eb-e7c71cd46038' class='xr-section-summary-in' type='checkbox'  checked><label for='section-118bf7cd-2642-40c3-b1eb-e7c71cd46038' class='xr-section-summary' >Attributes: <span>(1)</span></label><div class='xr-section-inline-details'></div><div class='xr-section-details'><dl class='xr-attrs'><dt><span>Conventions :</span></dt><dd>CF-1.7</dd></dl></div></li></ul></div></div>"
       ],
       "text/plain": [
        "<xarray.Dataset>\n",
@@ -1520,6 +1529,7 @@
        "  * station       (station) float64 0.0 1.0\n",
        "Data variables:\n",
        "    station_name  (station) |S75 ...\n",
+       "    altitude      (station) float64 ...\n",
        "    sconcno2      (time, station) float64 ...\n",
        "    lat           (station) float64 ...\n",
        "    lon           (station) float64 ...\n",
@@ -1902,20 +1912,21 @@
        "  * station       (station) float64 0.0 1.0\n",
        "Data variables:\n",
        "    station_name  (station) |S75 b&#x27;NO2-UM&#x27; b&#x27;NO2-ZAL Prat&#x27;\n",
+       "    altitude      (station) float64 nan nan\n",
        "    sconcno2      (time, station) float64 65.22 80.1 63.97 ... 20.7 nan 16.95\n",
        "    lat           (station) float64 41.37 41.32\n",
        "    lon           (station) float64 2.185 2.135\n",
        "Attributes:\n",
-       "    Conventions:  CF-1.7</pre><div class='xr-wrap' hidden><div class='xr-header'><div class='xr-obj-type'>xarray.Dataset</div></div><ul class='xr-sections'><li class='xr-section-item'><input id='section-0c486f1e-6ce7-4caf-b7e7-a10f38a83d64' class='xr-section-summary-in' type='checkbox' disabled ><label for='section-0c486f1e-6ce7-4caf-b7e7-a10f38a83d64' class='xr-section-summary'  title='Expand/collapse section'>Dimensions:</label><div class='xr-section-inline-details'><ul class='xr-dim-list'><li><span class='xr-has-index'>time</span>: 744</li><li><span class='xr-has-index'>station</span>: 2</li></ul></div><div class='xr-section-details'></div></li><li class='xr-section-item'><input id='section-d04b0765-a84c-4dc6-aabb-5eabdd87558c' class='xr-section-summary-in' type='checkbox'  checked><label for='section-d04b0765-a84c-4dc6-aabb-5eabdd87558c' class='xr-section-summary' >Coordinates: <span>(2)</span></label><div class='xr-section-inline-details'></div><div class='xr-section-details'><ul class='xr-var-list'><li class='xr-var-item'><div class='xr-var-name'><span class='xr-has-index'>time</span></div><div class='xr-var-dims'>(time)</div><div class='xr-var-dtype'>datetime64[ns]</div><div class='xr-var-preview xr-preview'>2019-12-01 ... 2019-12-31T23:00:00</div><input id='attrs-496bbd77-3041-4fb3-9db5-a6d5a894b61b' class='xr-var-attrs-in' type='checkbox' ><label for='attrs-496bbd77-3041-4fb3-9db5-a6d5a894b61b' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-be820443-0521-4dd3-b04f-f1a3d7950072' class='xr-var-data-in' type='checkbox'><label for='data-be820443-0521-4dd3-b04f-f1a3d7950072' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'><dt><span>standard_name :</span></dt><dd>time</dd><dt><span>long_name :</span></dt><dd>time</dd></dl></div><div class='xr-var-data'><pre>array([&#x27;2019-12-01T00:00:00.000000000&#x27;, &#x27;2019-12-01T01:00:00.000000000&#x27;,\n",
+       "    Conventions:  CF-1.7</pre><div class='xr-wrap' hidden><div class='xr-header'><div class='xr-obj-type'>xarray.Dataset</div></div><ul class='xr-sections'><li class='xr-section-item'><input id='section-661ceb1f-02a7-40e3-a951-274e431b47e1' class='xr-section-summary-in' type='checkbox' disabled ><label for='section-661ceb1f-02a7-40e3-a951-274e431b47e1' class='xr-section-summary'  title='Expand/collapse section'>Dimensions:</label><div class='xr-section-inline-details'><ul class='xr-dim-list'><li><span class='xr-has-index'>time</span>: 744</li><li><span class='xr-has-index'>station</span>: 2</li></ul></div><div class='xr-section-details'></div></li><li class='xr-section-item'><input id='section-f9607037-254f-44e7-8fb2-7828e2eefd69' class='xr-section-summary-in' type='checkbox'  checked><label for='section-f9607037-254f-44e7-8fb2-7828e2eefd69' class='xr-section-summary' >Coordinates: <span>(2)</span></label><div class='xr-section-inline-details'></div><div class='xr-section-details'><ul class='xr-var-list'><li class='xr-var-item'><div class='xr-var-name'><span class='xr-has-index'>time</span></div><div class='xr-var-dims'>(time)</div><div class='xr-var-dtype'>datetime64[ns]</div><div class='xr-var-preview xr-preview'>2019-12-01 ... 2019-12-31T23:00:00</div><input id='attrs-e5cf110e-f917-48c9-8ebe-9841fc577d6f' class='xr-var-attrs-in' type='checkbox' ><label for='attrs-e5cf110e-f917-48c9-8ebe-9841fc577d6f' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-b5608421-32d9-4065-85b4-dcb5f4924b70' class='xr-var-data-in' type='checkbox'><label for='data-b5608421-32d9-4065-85b4-dcb5f4924b70' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'><dt><span>standard_name :</span></dt><dd>time</dd><dt><span>long_name :</span></dt><dd>time</dd></dl></div><div class='xr-var-data'><pre>array([&#x27;2019-12-01T00:00:00.000000000&#x27;, &#x27;2019-12-01T01:00:00.000000000&#x27;,\n",
        "       &#x27;2019-12-01T02:00:00.000000000&#x27;, ..., &#x27;2019-12-31T21:00:00.000000000&#x27;,\n",
        "       &#x27;2019-12-31T22:00:00.000000000&#x27;, &#x27;2019-12-31T23:00:00.000000000&#x27;],\n",
-       "      dtype=&#x27;datetime64[ns]&#x27;)</pre></div></li><li class='xr-var-item'><div class='xr-var-name'><span class='xr-has-index'>station</span></div><div class='xr-var-dims'>(station)</div><div class='xr-var-dtype'>float64</div><div class='xr-var-preview xr-preview'>0.0 1.0</div><input id='attrs-dbd7be29-dbd0-4ca3-a972-4dac6066e08c' class='xr-var-attrs-in' type='checkbox' ><label for='attrs-dbd7be29-dbd0-4ca3-a972-4dac6066e08c' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-d35b2bae-76f3-4167-a685-fb745eb4e76b' class='xr-var-data-in' type='checkbox'><label for='data-d35b2bae-76f3-4167-a685-fb745eb4e76b' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'><dt><span>units :</span></dt><dd></dd><dt><span>axis :</span></dt><dd>X</dd><dt><span>long_name :</span></dt><dd></dd><dt><span>standard_name :</span></dt><dd>station</dd></dl></div><div class='xr-var-data'><pre>array([0., 1.])</pre></div></li></ul></div></li><li class='xr-section-item'><input id='section-c51af983-1c04-4055-be2e-1128151a2ac5' class='xr-section-summary-in' type='checkbox'  checked><label for='section-c51af983-1c04-4055-be2e-1128151a2ac5' class='xr-section-summary' >Data variables: <span>(4)</span></label><div class='xr-section-inline-details'></div><div class='xr-section-details'><ul class='xr-var-list'><li class='xr-var-item'><div class='xr-var-name'><span>station_name</span></div><div class='xr-var-dims'>(station)</div><div class='xr-var-dtype'>|S75</div><div class='xr-var-preview xr-preview'>...</div><input id='attrs-32a612ca-803e-4432-9015-dcaece8ae8bc' class='xr-var-attrs-in' type='checkbox' ><label for='attrs-32a612ca-803e-4432-9015-dcaece8ae8bc' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-c86b1fc0-bae8-4dbb-9166-e78d945df264' class='xr-var-data-in' type='checkbox'><label for='data-c86b1fc0-bae8-4dbb-9166-e78d945df264' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'><dt><span>standard_name :</span></dt><dd></dd></dl></div><div class='xr-var-data'><pre>array([b&#x27;NO2-UM&#x27;, b&#x27;NO2-ZAL Prat&#x27;], dtype=&#x27;|S75&#x27;)</pre></div></li><li class='xr-var-item'><div class='xr-var-name'><span>sconcno2</span></div><div class='xr-var-dims'>(time, station)</div><div class='xr-var-dtype'>float64</div><div class='xr-var-preview xr-preview'>...</div><input id='attrs-dc8147d7-c2e1-43a8-8288-2eda8fe7b764' class='xr-var-attrs-in' type='checkbox' ><label for='attrs-dc8147d7-c2e1-43a8-8288-2eda8fe7b764' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-5ff7ea02-9f5e-400d-93f9-317fe696b7c8' class='xr-var-data-in' type='checkbox'><label for='data-5ff7ea02-9f5e-400d-93f9-317fe696b7c8' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'><dt><span>units :</span></dt><dd>µg m-3</dd><dt><span>long_name :</span></dt><dd></dd></dl></div><div class='xr-var-data'><pre>array([[65.22, 80.1 ],\n",
+       "      dtype=&#x27;datetime64[ns]&#x27;)</pre></div></li><li class='xr-var-item'><div class='xr-var-name'><span class='xr-has-index'>station</span></div><div class='xr-var-dims'>(station)</div><div class='xr-var-dtype'>float64</div><div class='xr-var-preview xr-preview'>0.0 1.0</div><input id='attrs-bb662d99-c929-404d-8c99-2b9aeaa94b2c' class='xr-var-attrs-in' type='checkbox' ><label for='attrs-bb662d99-c929-404d-8c99-2b9aeaa94b2c' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-7b66cd77-682b-428b-bf5c-464f685af59f' class='xr-var-data-in' type='checkbox'><label for='data-7b66cd77-682b-428b-bf5c-464f685af59f' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'><dt><span>units :</span></dt><dd></dd><dt><span>axis :</span></dt><dd>X</dd><dt><span>long_name :</span></dt><dd></dd><dt><span>standard_name :</span></dt><dd>station</dd></dl></div><div class='xr-var-data'><pre>array([0., 1.])</pre></div></li></ul></div></li><li class='xr-section-item'><input id='section-11f1e9aa-f51b-43fc-8765-149569647693' class='xr-section-summary-in' type='checkbox'  checked><label for='section-11f1e9aa-f51b-43fc-8765-149569647693' class='xr-section-summary' >Data variables: <span>(5)</span></label><div class='xr-section-inline-details'></div><div class='xr-section-details'><ul class='xr-var-list'><li class='xr-var-item'><div class='xr-var-name'><span>station_name</span></div><div class='xr-var-dims'>(station)</div><div class='xr-var-dtype'>|S75</div><div class='xr-var-preview xr-preview'>...</div><input id='attrs-dbb97032-9883-4fee-a21e-21e38b7de537' class='xr-var-attrs-in' type='checkbox' ><label for='attrs-dbb97032-9883-4fee-a21e-21e38b7de537' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-279838ac-cb03-408b-9032-e8fcc51c3aa1' class='xr-var-data-in' type='checkbox'><label for='data-279838ac-cb03-408b-9032-e8fcc51c3aa1' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'><dt><span>standard_name :</span></dt><dd></dd></dl></div><div class='xr-var-data'><pre>array([b&#x27;NO2-UM&#x27;, b&#x27;NO2-ZAL Prat&#x27;], dtype=&#x27;|S75&#x27;)</pre></div></li><li class='xr-var-item'><div class='xr-var-name'><span>altitude</span></div><div class='xr-var-dims'>(station)</div><div class='xr-var-dtype'>float64</div><div class='xr-var-preview xr-preview'>...</div><input id='attrs-e56a690e-61cb-4d32-a10f-9605aac04cab' class='xr-var-attrs-in' type='checkbox' ><label for='attrs-e56a690e-61cb-4d32-a10f-9605aac04cab' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-ee87a4c2-baba-495e-a1cc-978276851669' class='xr-var-data-in' type='checkbox'><label for='data-ee87a4c2-baba-495e-a1cc-978276851669' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'><dt><span>units :</span></dt><dd>meters</dd><dt><span>standard_name :</span></dt><dd>altitude</dd></dl></div><div class='xr-var-data'><pre>array([nan, nan])</pre></div></li><li class='xr-var-item'><div class='xr-var-name'><span>sconcno2</span></div><div class='xr-var-dims'>(time, station)</div><div class='xr-var-dtype'>float64</div><div class='xr-var-preview xr-preview'>...</div><input id='attrs-fbd68cc3-e15f-45ac-b050-50a68a7214fd' class='xr-var-attrs-in' type='checkbox' ><label for='attrs-fbd68cc3-e15f-45ac-b050-50a68a7214fd' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-5c968617-ecac-4891-909a-35df08ed8c61' class='xr-var-data-in' type='checkbox'><label for='data-5c968617-ecac-4891-909a-35df08ed8c61' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'><dt><span>units :</span></dt><dd>µg m-3</dd><dt><span>long_name :</span></dt><dd></dd></dl></div><div class='xr-var-data'><pre>array([[65.22, 80.1 ],\n",
        "       [63.97, 81.52],\n",
        "       [57.43, 65.34],\n",
        "       ...,\n",
        "       [  nan, 25.97],\n",
        "       [  nan, 20.7 ],\n",
-       "       [  nan, 16.95]])</pre></div></li><li class='xr-var-item'><div class='xr-var-name'><span>lat</span></div><div class='xr-var-dims'>(station)</div><div class='xr-var-dtype'>float64</div><div class='xr-var-preview xr-preview'>...</div><input id='attrs-f96a81ed-5063-4d88-bddc-c6dac59c99dc' class='xr-var-attrs-in' type='checkbox' ><label for='attrs-f96a81ed-5063-4d88-bddc-c6dac59c99dc' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-00b22f12-0bdb-4cb3-9a07-85b2129bb957' class='xr-var-data-in' type='checkbox'><label for='data-00b22f12-0bdb-4cb3-9a07-85b2129bb957' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'><dt><span>units :</span></dt><dd>degrees_north</dd><dt><span>axis :</span></dt><dd>Y</dd><dt><span>long_name :</span></dt><dd>latitude coordinate</dd><dt><span>standard_name :</span></dt><dd>latitude</dd></dl></div><div class='xr-var-data'><pre>array([41.373777, 41.317277])</pre></div></li><li class='xr-var-item'><div class='xr-var-name'><span>lon</span></div><div class='xr-var-dims'>(station)</div><div class='xr-var-dtype'>float64</div><div class='xr-var-preview xr-preview'>...</div><input id='attrs-f00b32bb-18a7-48b8-a8ee-4e043d842b94' class='xr-var-attrs-in' type='checkbox' ><label for='attrs-f00b32bb-18a7-48b8-a8ee-4e043d842b94' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-ddabc09d-5b1d-42d4-a1a5-248fb29b84df' class='xr-var-data-in' type='checkbox'><label for='data-ddabc09d-5b1d-42d4-a1a5-248fb29b84df' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'><dt><span>units :</span></dt><dd>degrees_east</dd><dt><span>axis :</span></dt><dd>X</dd><dt><span>long_name :</span></dt><dd>longitude coordinate</dd><dt><span>standard_name :</span></dt><dd>longitude</dd></dl></div><div class='xr-var-data'><pre>array([2.184514, 2.134501])</pre></div></li></ul></div></li><li class='xr-section-item'><input id='section-819f5287-7aad-40a3-83e7-9cb5f1f7c1c6' class='xr-section-summary-in' type='checkbox'  checked><label for='section-819f5287-7aad-40a3-83e7-9cb5f1f7c1c6' class='xr-section-summary' >Attributes: <span>(1)</span></label><div class='xr-section-inline-details'></div><div class='xr-section-details'><dl class='xr-attrs'><dt><span>Conventions :</span></dt><dd>CF-1.7</dd></dl></div></li></ul></div></div>"
+       "       [  nan, 16.95]])</pre></div></li><li class='xr-var-item'><div class='xr-var-name'><span>lat</span></div><div class='xr-var-dims'>(station)</div><div class='xr-var-dtype'>float64</div><div class='xr-var-preview xr-preview'>...</div><input id='attrs-8749a965-8479-4a3c-80f0-2283675706d2' class='xr-var-attrs-in' type='checkbox' ><label for='attrs-8749a965-8479-4a3c-80f0-2283675706d2' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-b6f0c317-4939-4a87-9f87-fe7efa4dd209' class='xr-var-data-in' type='checkbox'><label for='data-b6f0c317-4939-4a87-9f87-fe7efa4dd209' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'><dt><span>units :</span></dt><dd>degrees_north</dd><dt><span>axis :</span></dt><dd>Y</dd><dt><span>long_name :</span></dt><dd>latitude coordinate</dd><dt><span>standard_name :</span></dt><dd>latitude</dd></dl></div><div class='xr-var-data'><pre>array([41.373777, 41.317277])</pre></div></li><li class='xr-var-item'><div class='xr-var-name'><span>lon</span></div><div class='xr-var-dims'>(station)</div><div class='xr-var-dtype'>float64</div><div class='xr-var-preview xr-preview'>...</div><input id='attrs-719339bf-4623-4d46-9aca-fed4da1a3585' class='xr-var-attrs-in' type='checkbox' ><label for='attrs-719339bf-4623-4d46-9aca-fed4da1a3585' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-a2081ed8-18f8-4965-9eec-3058c5f4560c' class='xr-var-data-in' type='checkbox'><label for='data-a2081ed8-18f8-4965-9eec-3058c5f4560c' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'><dt><span>units :</span></dt><dd>degrees_east</dd><dt><span>axis :</span></dt><dd>X</dd><dt><span>long_name :</span></dt><dd>longitude coordinate</dd><dt><span>standard_name :</span></dt><dd>longitude</dd></dl></div><div class='xr-var-data'><pre>array([2.184514, 2.134501])</pre></div></li></ul></div></li><li class='xr-section-item'><input id='section-999d341b-6381-4b7f-b4cf-98c9490e5d90' class='xr-section-summary-in' type='checkbox'  checked><label for='section-999d341b-6381-4b7f-b4cf-98c9490e5d90' class='xr-section-summary' >Attributes: <span>(1)</span></label><div class='xr-section-inline-details'></div><div class='xr-section-details'><dl class='xr-attrs'><dt><span>Conventions :</span></dt><dd>CF-1.7</dd></dl></div></li></ul></div></div>"
       ],
       "text/plain": [
        "<xarray.Dataset>\n",
@@ -1925,6 +1936,7 @@
        "  * station       (station) float64 0.0 1.0\n",
        "Data variables:\n",
        "    station_name  (station) |S75 ...\n",
+       "    altitude      (station) float64 ...\n",
        "    sconcno2      (time, station) float64 ...\n",
        "    lat           (station) float64 ...\n",
        "    lon           (station) float64 ...\n",
@@ -1940,6 +1952,13 @@
    "source": [
     "xr.open_dataset('/esarchive/obs/generalitat/port-barcelona/hourly/sconcno2/sconcno2_201912.nc')"
    ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": []
   }
  ],
  "metadata": {