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# Molecular weights file
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The molecular weights file contains the molecular weight of each input pollutant.
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This information is used to perform a mass-to-mole conversion for gas species. Note that for aerosol species the molecular weight is set to 1.
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## Example
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```text
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Specie,MW
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nox_no,30.01
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nox_no2,46.01
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co,28.01
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co2,44.01
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so2,64.06
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nh3,17.03
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pm10,1.0
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pm25,1.0
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oc,1.0
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bc,1.0
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ch4,16.04
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c2h6s,62.13
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hcl,36.46
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c2h2,26.04
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ch3cooh,60.05
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c2h4o,44.05
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c4h10,58.12
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c2h5oh,46.07
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ch2o,30.03
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c6h14,86.18
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hialkanes,118.89
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c5h8,68.12
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c8h16,112.21
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c5h10,70.13
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c3h6,42.08
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c7h8,92.14
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c8h10,106.17
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c3h6o,58.08
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c6h6,78.11
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c4h8,56.11
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c2h6,30.07
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c2h4,28.05
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c7h16,100.2
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c6h12,84.16
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hialkenes,75.78
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ch3oh,32.04
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c5h12,72.15
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c3h8,44.1
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terpenes,160.0
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voc01,46.2
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voc02,30.07
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voc03,44.1
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voc04,58.12
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voc05,72.15
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voc06,107.2
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voc07,28.05
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voc08,42.08
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voc09,26.04
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voc10,68.12
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voc11,136.24
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voc12,67
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voc13,78.11
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voc14,92.14
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voc15,106.17
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voc16,120.0
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voc17,126.8
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voc18,104.7
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voc19,81.5
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voc20,138.8
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voc21,30.03
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voc22,68.8
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voc23,75.3
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voc24,59.1
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voc25,86.9
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nmvoc,1.0
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```
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## Columns
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| **Option** | **Details** |
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| :--------: | :----- |
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| Specie | Name of the input pollutant |
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| MW | Molecular weight (g/mol) |
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[Go to User guide page](user_guide) |
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\ No newline at end of file |