###------------------------------------------------------------------------------------###
PROCESSING AQS DETAILS              

DENE BOWDALO, Updated 2nd May 2018

###------------------------------------------------------------------------------------###
PROCESSING NOTES

*Qualifiers: https://aqs.epa.gov/aqsweb/documents/codetables/qualifiers.html

*Sampling methods for all parameters: 
https://aqs.epa.gov/aqsweb/documents/codetables/methods_all.html

###------------------------------------------------------------------------------------###
NETWORK DESCRIPTION

The Air Quality System (AQS) contains ambient air pollution data collected by EPA, state, 
local, and tribal air pollution control agencies from over thousands of monitors.  AQS 
also contains meteorological data, descriptive information about each monitoring station 
(including its geographic location and its operator), and data quality assurance/quality 
control information.  AQS data is used to: assess air quality, assist in attainment/
non-attainment designations, evaluate State Implementation Plans for non-attainment areas,
perform modeling for permit review analysis, and prepare reports for Congress as mandated 
by the Clean Air Act.

DESCRIPTION URL: https://www.epa.gov/aqs
     
DATA ACCESS URL: https://aqs.epa.gov/aqsweb/airdata/download_files.html#Raw

###------------------------------------------------------------------------------------###
QUALITY ASSESSMENT LEVEL 

Not Stated

###------------------------------------------------------------------------------------###
CONTACT

US EPA, OAQPS/OID/NADG, ATTN: AQS, MD-C339-01, Research Triangle Park, NC 27711
aqsteam@epa.gov

###------------------------------------------------------------------------------------###
AVAIALABLE SPECIES (DATA LAST ACCESSED: 26TH APRIL)

Ozone (1980-2018)
Nitric Oxide (1980-2018)
Nitrogen Dioxide (1980-2018)
Carbon Monoxide (1980-2018)
Isoprene (1980-2018) 

###------------------------------------------------------------------------------------###
FORMAT


###------------------------------------------------------------------------------------###
METADATA/DETAIL FILES

CORE
aqs_sites.csv
aqs_monitors.csv
methods_all.csv
Ozone_Active.csv
Ozone_Inactive.csv
NO2_Active.csv
NO2_Inactive.csv
CO_Active.csv
CO_Inactive.csv
IMPROVE_Active.csv
IMPROVE_Inactive.csv
NATTS_Active.csv
NATTS_Inactive.csv
NCORE_Active.csv
NCORE_Inactive.csv

OTHER
aqs_data_dictionary.pdf
EPA_NOy_Measurment_Description.pdf
reference_equivalent_methods.pdf
Review_Verification_Validation_Description.pdf
user_data_coding_manual.pdf
qualifiers.csv


INSTRUMENT MANUALS


Nitrogen Dioxide

Teledyne_200E_Manual.pdf
Teledyne_200EU_addendum.pdf
Teledyne_200EU-NOy_addendum.pdf


###------------------------------------------------------------------------------------###
DATAFILE VARIABLES

State Code
County Code
Site Num
Parameter Code
POC
Latitude
Longitude
Datum
Parameter Name
Date Local
Time Local
Date GMT
Time GMT
Sample Measurement
Units of Measure
MDL
Uncertainty
Qualifier
Method Type
Method Code
Method Name
State Name
County Name
Date of Last Change


###------------------------------------------------------------------------------------###
METADATA VARIABLES

aqs_sites.csv:

State Code
County Code
Site Number
Latitude
Longitude
Datum
Elevation
Land Use
Location Setting
Site Established Date
Site Closed Date
Met Site State Code
Met Site County Code
Met Site Site Number
Met Site Type
Met Site Distance
Met Site Direction
GMT Offset
Owning Agency
Local Site Name
Address
Zip Code
State Name
County Name
City Name
CBSA Name
Tribe Name
Extraction Date

aqs_monitors.csv:

State Code
County Code
Site Number
Parameter Code
Parameter Name
POC
Latitude
Longitude
Datum
First Year of Data
Last Sample Date
Monitor Type
Networks
Reporting Agency
PQAO
Collecting Agency
Exclusions
Monitoring Objective
Last Method Code
Last Method
NAAQS Primary Monitor
QA Primary Monitor
Local Site Name
Address
State Name
County Name
City Name
CBSA Name
Tribe Name
Extraction Date

<species>_<Active/Inactive>.txt:

OBJECTID
AQS_Site_ID
POC
Annual_URLs
Daily_URLs
State
City
CBSA
Local_Site_Name
Address
Latitude
Longitude
Datum
LatLon_Accuracy_meters
Elevation_meters_MSL
Parameter_Name
Monitor_Start_Date
Last_Sample_Date
Measurement_Scale
Measurement_Scale_Definition
Sample_Duration
Sample_Collection_Frequency
Sample_Collection_Method
Method_Reference_ID
FRMFEM
Monitor_Type
Reporting_Agency
Sample_Analysis_Method
x
y

methods_all.csv:

Parameter
Parameter Code
Method Code
Recording Mode
Collection Description
Analysis Description
Method Type
Reference Method ID
Equivalent Method
Federal MDL
Min Value
Max Value
Digits
Round Truncate Indicator
Units

###------------------------------------------------------------------------------------###
UNITS (Source: data files)

Ozone             given line by line in each datafile (typically ppmv)  
Nitric Oxide      given line by line in each datafile (typically ppbv) 
Nitric Dioxide    given line by line in each datafile (typically ppbv) 
Carbon Monoxide   given line by line in each datafile (typically ppmv) 
Isoprene          given line by line in each datafile (typically ppbC) 

###------------------------------------------------------------------------------------###
UNIT PRECISION (Sources: methods_all.csv)


Nitrogen Dioxide  




 


Beckman 952A                     ---    **cannot find documentation for Beckman 952A 
 
 
 


###------------------------------------------------------------------------------------###
LIMIT OF DETECTION (Sources: methods_all.csv, )

**Defined as twice the zero noise level by the US EPA - and is typically reported as such

Each hourly measurement comes with an associated limit of detection. Should use these
primarily as they can vary through time record as instrumentalists monitor measurement 
accuracy. 


 
 


     

             

Beckman 952A                   5.0  ppbv   **given in methods_all.csv as 5.0ppbv, cannot
                                           find documentation for Beckman 952A 
 

###------------------------------------------------------------------------------------###
REPRESENTIVITY (Source: )

SITE TYPES
None Given

LOCAL LAND USE CLASSIFICATION (prevalent land use within 1/4 mile of that site)
AGRICULTURAL
BLIGHTED AREAS
COMMERCIAL
DESERT
FOREST
INDUSTRIAL
MILITARY RESERVATION
MOBILE
RESIDENTIAL
UNKNOWN

LEVELS OF URBANISATION (A description of the environmental setting within which the site 
                        is located)
RURAL
SUBURBAN
URBAN AND CENTER CITY
UNKNOWN


NEIGHBOURHOOD POPULATION 
None Given

SCALE OF REPRESENTATIVENESS 

A denotation of the geographic scope of the air quality measurements made by the monitor. 
The implication is that the same measurement made elsewhere within the measurement scale 
would produce an equivalent result to that produced at the monitoring site

MICROSCALE (0 M TO 100 M)
MIDDLE SCALE (100 M TO 500 M)
NEIGHBORHOOD (500 M TO 4KM)
URBAN SCALE (4 KM TO 50 KM)
REGIONAL SCALE (50 TO HUNDREDS KM)

TERRAIN
None Given

###------------------------------------------------------------------------------------###
MEASUREMENT METHODLOGIES (Sources: methods_all.csv, )

Given line by line, for each measurement, but there is also an extensive list of 
measurement methodologies per species (with more details) in methods_all.csv. Each 
different measurement methodology/instrumental combination is given a numerical code for 
reference in the datafiles.

Ozone - 

Nitric Oxide - 

Nitrogen Dioxide 

Continuous (1 hour average) chemiluminescence (conversion-molybdenum)
Continuous (1 hour average) chemiluminescence (conversion-photolysis)
Continuous (1 hour average) cavity attenuated phase shift spectroscopy
Continuous (1 hour average) differential optical absorption spectroscopy
Continuous (1 hour average) colorimetric
Continuous (1 hour average) spectrophotometry
Continuous (1 hour average) coulometry
Intermittent colorimetric 
Intermittent spectrophotometry
Intermittent ion chromatography

Carbon Monoxide - 

Isoprene - 

###------------------------------------------------------------------------------------###
INSTRUMENT NAME/MODEL NUMBERS (Sources: methods_all.csv,


In methods_all.csv is an extensive description of all types of methodologies per species, 
with the different instrument names used. Each different measurement 
methodology/instrumental combination is given a numerical code for reference in the 
datafiles.

#-------------------------
Ozone

Meloy 0A325-2R,                       ethylene chemiluminescence,                        continuous,   Method Code=3
Meloy 0A350-2R,                       ethylene chemiluminescence,                        continuous,   Method Code=4
Bendix 8002,                          ethylene chemiluminescence,                        continuous,   Method Code=7
                                      ethylene chemiluminescence,                        continuous,   Method Code=11
McMillan 1100-1,                      ethylene chemiluminescence,                        continuous,   Method Code=14
McMillan 1100-2,                      ethylene chemiluminescence,                        continuous,   Method Code=15
McMillan 1100-3,                      ethylene chemiluminescence,                        continuous,   Method Code=16    
Monitor Labs 8410E,                   ethylene chemiluminescence,                        continuous,   Method Code=17        
Dasibi 1003-AH/PC/RS,                 ultraviolet photometry,                            continuous,   Method Code=19  
Beckman 950A,                         ethylene chemiluminescence,                        continuous,   Method Code=20  
Philips PW9771,                       ethylene chemiluminescence,                        continuous,   Method Code=23 
CSI 2000,                             ethylene chemiluminescence,                        continuous,   Method Code=36 
Thermo 49,                            ultraviolet photometry,                            continuous,   Method Code=47 
Monitor Labs 8810,                    ultraviolet photometry,                            continuous,   Method Code=53
PCI LC-12,                            ultraviolet photometry,                            continuous,   Method Code=55
Dasibi 1008-AH,                       ultraviolet photometry,                            continuous,   Method Code=56
Environics 300,                       ultraviolet photometry,                            continuous,   Method Code=78
API 400,                              ultraviolet photometry,                            continuous,   Method Code=87
Monitor Labs 9810,                    ultraviolet photometry,                            continuous,   Method Code=91
OPSIS AR500,                          differential optical absorption spectroscopy,      continuous,   Method Code=103
Environnement SA Q341M,               ultraviolet photometry,                            continuous,   Method Code=105
Horiba APOA360 ,                      ultraviolet photometry,                            continuous,   Method Code=112
DKK-TOA GUX-113E,                     ultraviolet photometry,                            continuous,   Method Code=134
Environnement SA SANOA,               ultraviolet photometry,                            continuous,   Method Code=137
Environnement SA O342M,               ultraviolet photometry,                            continuous,   Method Code=148
Horiba APOA370,                       ultraviolet photometry,                            continuous,   Method Code=160
Seres OZ 2000G,                       ultraviolet photometry,                            continuous,   Method Code=161
SIR SA S-5014,                        ultraviolet photometry,                            continuous,   Method Code=164
Tanabyte 722/723/724/725/726,         ultraviolet photometry,                            continuous,   Method Code=165
DKK-TOA GUX-313E,                     ultraviolet photometry,                            continuous,   Method Code=169
Ecotech Serinus10,                    ultraviolet photometry,                            continuous,   Method Code=187
2B 202/205,                           ultraviolet photometry,                            continuous,   Method Code=190
Teledyne 265E/T265,                   ultraviolet photometry,                            continuous,   Method Code=199
Teledyne T204,                        ultraviolet photometry,                            continuous,   Method Code=214
2B 211,                               ultraviolet photometry,                            continuous,   Method Code=215
2B 106-L/106-OEM-L,                   ultraviolet photometry,                            continuous,   Method Code=218
Sabio 6030,                           ultraviolet photometry,                            continuous,   Method Code=222
Environnement SA O342e,               ultraviolet photometry,                            continuous,   Method Code=225
2B POM,                               ultraviolet photometry,                            continuous,   Method Code=227
2B 202,                               ultraviolet photometry,                            continuous,   Method Code=901

#-------------------------
Nitric Oxide 

Lyshkow,                              colorimetric,                                      continuous,   Method Code=11 
                                      chemiluminescence (internal molybdenum converter), continuous,   Method Code=14
Monitor Labs 8440E,                   chemiluminescence (internal molybdenum converter), continuous,   Method Code=21
Bendix 8101-C,                        chemiluminescence (internal molybdenum converter), continuous,   Method Code=22
CSI 1600,                             chemiluminescence (internal molybdenum converter), continuous,   Method Code=25
Meloy NA530R,                         chemiluminescence (internal molybdenum converter), continuous,   Method Code=31
Beckman 952A,                         chemiluminescence (internal molybdenum converter), continuous,   Method Code=34
Thermo 14B/E,                         chemiluminescence (internal molybdenum converter), continuous,   Method Code=35
Thermo 14D/E,                         chemiluminescence (internal molybdenum converter), continuous,   Method Code=37
Bendix 8101-B,                        chemiluminescence (internal molybdenum converter), continuous,   Method Code=38
Philips PW9762/02,                    chemiluminescence (internal molybdenum converter), continuous,   Method Code=40
Monitor Labs 8840,                    chemiluminescence (internal molybdenum converter), continuous,   Method Code=42
Griess Saltzman (999 AP-11),          spectrophotometry,                               , intermittent, Method Code=61 
Griess Saltzman (50ml tube+Orifice),  spectrophotometry,                               , intermittent, Method Code=71 
Thermo 42,                            chemiluminescence (internal molybdenum converter), continuous,   Method Code=74
Thermo 42S,                           chemiluminescence (internal molybdenum converter), continuous,   Method Code=75  
Advanced Poll 200,                    chemiluminescence (internal molybdenum converter), continuous,   Method Code=82 
Monitor Labs 8841,                    chemiluminescence (internal molybdenum converter), continuous,   Method Code=83 
Dasibi 2108,                          chemiluminescence (internal molybdenum converter), continuous,   Method Code=89 
Ecotech ML9841,                       chemiluminescence (internal molybdenum converter), continuous,   Method Code=90
Griess Saltzman (100ml tube+Orifice), spectrophotometry,                                 intermittent, Method Code=91
Teledyne 200A/Teledyne 200E,          chemiluminescence (internal molybdenum converter), continuous,   Method Code=99
                                      chemiluminescence (internal molybdenum converter), continuous,   Method Code=100
Horiba APNA360,                       chemiluminescence (internal molybdenum converter), continuous,   Method Code=111
Environnement SA AC32M,               chemiluminescence (internal molybdenum converter), continuous,   Method Code=146
SIR SA S-5012,                        chemiluminescence (internal molybdenum converter), continuous,   Method Code=152
Horiba APNA370                        chemiluminescence (internal molybdenum converter), continuous,   Method Code=157 
Seres 2000G,                          chemiluminescence (internal molybdenum converter), continuous,   Method Code=163
DKK-TOA GLN-314E,                     chemiluminescence (internal molybdenum converter), continuous,   Method Code=171 
Ecotech Serinus40,                    chemiluminescence (internal molybdenum converter), continuous,   Method Code=186
Teledyne T200UP,                      chemiluminescence (internal photolytic converter), continuous,   Method Code=200
Teledyne T200P,                       chemiluminescence (internal photolytic converter), continuous,   Method Code=241
Thermo 42C-NOy/Thermo 42i-NOy,        chemiluminescence (external molybdenum converter), continuous,   Method Code=574
Ecotech EC9841T,                      chemiluminescence (internal molybdenum converter), continuous,   Method Code=590
Ecotech EC9843                        chemiluminescence (external molybdenum converter), continuous,   Method Code=591
Teledyne 200EU-NOy,                   chemiluminescence (external molybdenum converter), continuous,   Method Code=599
Thermo 42C-NOy/Thermo 42i-NOy,        chemiluminescence (external molybdenum converter), continuous,   Method Code=674
Ecotech EC9841T,                      chemiluminescence (internal molybdenum converter), continuous,   Method Code=690
Ecotech EC9843                        chemiluminescence (external molybdenum converter), continuous,   Method Code=691
Teledyne 200EU-NOy,                   chemiluminescence (external molybdenum converter), continuous,   Method Code=699

#-------------------------
Nitrogen Dioxide 

                                      ion chromatography,                                intermittent, Method Code=10 
Lyshkow,                              colorimetric,                                      continuous,   Method Code=11 
Griess Saltzman,                      colorimetric,                                      continuous,   Method Code=12
                                      coulometry,                                        continuous,   Method Code=13 
                                      chemiluminescence (internal molybdenum converter), continuous,   Method Code=14
Griess Saltzman (Poland),             spectrophotometry,                                 continuous,   Method Code=16
Monitor Labs 8440E,                   chemiluminescence (internal molybdenum converter), continuous,   Method Code=21
Bendix 8101-C,                        chemiluminescence (internal molybdenum converter), continuous,   Method Code=22
CSI 1600,                             chemiluminescence (internal molybdenum converter), continuous,   Method Code=25
Meloy NA530R,                         chemiluminescence (internal molybdenum converter), continuous,   Method Code=31
Beckman 952A,                         chemiluminescence (internal molybdenum converter), continuous,   Method Code=34
Thermo 14B/E,                         chemiluminescence (internal molybdenum converter), continuous,   Method Code=35
Thermo 14D/E,                         chemiluminescence (internal molybdenum converter), continuous,   Method Code=37
Bendix 8101-B,                        chemiluminescence (internal molybdenum converter), continuous,   Method Code=38
Philips PW9762/02,                    chemiluminescence (internal molybdenum converter), continuous,   Method Code=40
Monitor Labs 8840,                    chemiluminescence (internal molybdenum converter), continuous,   Method Code=42
Thermo 42,                            chemiluminescence (internal molybdenum converter), continuous,   Method Code=74
Thermo 42S,                           chemiluminescence (internal molybdenum converter), continuous,   Method Code=75                
Advanced Poll 200,                    chemiluminescence (internal molybdenum converter), continuous,   Method Code=82 
Monitor Labs 8841,                    chemiluminescence (internal molybdenum converter), continuous,   Method Code=83 
Dasibi 2108,                          chemiluminescence (internal molybdenum converter), continuous,   Method Code=89 
Ecotech ML9841,                       chemiluminescence (internal molybdenum converter), continuous,   Method Code=90
Griess Saltzman (100ml tube+Orifice), spectrophotometry,                                 intermittent, Method Code=91
Sodium Arsenite (Frit),               spectrophotometry,                                 intermittent, Method Code=94
TEA (Frit),                           spectrophotometry,                                 intermittent, Method Code=95
TGS-ANSA (Frit),                      spectrophotometry,                                 intermittent, Method Code=96
TEA (Orifice),                        spectrophotometry,                                 intermittent, Method Code=97
Teledyne 200A/Teledyne 200E,          chemiluminescence (internal molybdenum converter), continuous,   Method Code=99
OPSIS AR500,                          differential optical absorption spectroscopy,      continuous,   Method Code=102
Environnement SA AC31M,               chemiluminescence (internal molybdenum converter), continuous,   Method Code=104
Horiba APNA360,                       chemiluminescence (internal molybdenum converter), continuous,   Method Code=111
DKK-TOA GLN-114E,                     chemiluminescence (internal molybdenum converter), continuous,   Method Code=121
Environnement SA SANOA,               differential optical absorption spectroscopy,      continuous,   Method Code=139
Environnement SA AC32M,               chemiluminescence (internal molybdenum converter), continuous,   Method Code=146
SIR SA S-5012,                        chemiluminescence (internal molybdenum converter), continuous,   Method Code=152
Horiba APNA370                        chemiluminescence (internal molybdenum converter), continuous,   Method Code=157 
Seres 2000G,                          chemiluminescence (internal molybdenum converter), continuous,   Method Code=163
DKK-TOA GLN-314E,                     chemiluminescence (internal molybdenum converter), continuous,   Method Code=171 
Ecotech Serinus40,                    chemiluminescence (internal molybdenum converter), continuous,   Method Code=186
Teledyne T200UP,                      chemiluminescence (internal photolytic converter), continuous,   Method Code=200
Environnement SA AS32M,               cavity attenuated phase shift spectroscopy,        continuous,   Method Code=210
Teledyne T500U,                       cavity attenuated phase shift spectroscopy,        continuous,   Method Code=212
Teledyne T200P,                       chemiluminescence (internal photolytic converter), continuous,   Method Code=241
Thermo 42C-TL/Thermo 42i-TL,          chemiluminescence (internal molybdenum converter), continuous,   Method Code=574
Ecotech EC9841T,                      chemiluminescence (internal molybdenum converter), continuous,   Method Code=590
Teledyne 200EU,                       chemiluminescence (internal molybdenum converter), continuous,   Method Code=599

#-------------------------     
Carbon Monoxide 

Bendix 8501-5CA,                      non-dispersive infrared spectroscopy,              continuous,   Method Code=8 

LGR Off-Axis ICOS,                    cavity ringdown spectroscopy                       continuous,   Method Code=130
Environnement SA CO12M,               non-dispersive infrared spectroscopy,              continuous,   Method Code=147
Horiba APMA370,                       non-dispersive infrared spectroscopy,              continuous,   Method Code=158
DKK-TOA GFC-311E,                     non-dispersive infrared spectroscopy,              continuous,   Method Code=167
SIR SA S-5006,                        non-dispersive infrared spectroscopy,              continuous,   Method Code=172
Ecotech Serinus30,                    non-dispersive infrared spectroscopy,              continuous,   Method Code=174
Thermo 48i-TLE,                       non-dispersive infrared spectroscopy,              continuous,   Method Code=554
LGR Off-Axis ICOS,                    cavity ringdown spectroscopy,                      continuous,   Method Code=562
Ecotech EC9830T,                      non-dispersive infrared spectroscopy,              continuous,   Method Code=588 
Teledyne 300EU,                       non-dispersive infrared spectroscopy,              continuous,   Method Code=593 
Teledyne 300EU,                       non-dispersive infrared spectroscopy,              continuous,   Method Code=594 
#-------------------------
Isoprene 


###------------------------------------------------------------------------------------###
NETWORK DATA FLAGS (Sources: qualifiers.csv)

Request Exclusion Codes 
Required when submitting data that is affected by an Exceptional Event and for which an 
exclusion will be requested

RA  African Dust  
RB  Asian Dust  
RC  Chem. Spills & Indust. Accidents  
RC  Chem. Spills & Indust. Accidents  
RD  Cleanup After a Major Disaster  
RE  Demolition  
RF  Fire - Canadian  
RG  Fire - Mexico/Central America 
RH  Fireworks  
RI  High Pollen Count  
RJ  High Winds  
RK  Infrequent Large Gatherings  
RL  Other  
RM  Prescribed Fire  
RN  Seismic Activity  
RO  Stratospheric Ozone Intrusion  
RP  Structural Fire  
RQ  Terrorist Act  
RR  Unique Traffic Disruption  
RS  Volcanic Eruptions  
RT  Wildfire-USA  

E   Forest Fire (Not Active)  
RU  Wildland Fire Use Fire-USA (Not Active)  


Quality Assurance Codes 
Quality assurance qualifiers are used when data is valid but you want to note something. 
i.e. measurement was "Below lowest calibration level"

1   Deviation from a CFR/Critical Criteria Requirement
1V  Data reviewed and validated  
2   Operational Deviation
3   Field Issue
4   Lab Issue
5   Outlier  
6   QAPP Issue
7   Below Lowest Calibration Level  
9   Negative value detected - zero reported  
CB  Values have been Blank Corrected
CC  Clean Canister Residue
CL  Surrogate Recoveries Outside Control Limits
DI  Sample was diluted for analysis
DN  DNPH peak less than NATTS TAD requirement, reported value should be considered an 
    estimate
EH  Estimated; Exceeds Upper Range
FB  Field Blank Value Above Acceptable Limit  
FX  Filter Integrity Issue  
HT  Sample pick-up hold time exceeded
LB  Lab blank value above acceptable limit  
LJ  Identification Of Analyte Is Acceptable; Reported Value Is An Estimate  
LK  Analyte Identified; Reported Value May Be Biased High  
LL  Analyte Identified; Reported Value May Be Biased Low  
MD  Value less than MDL  
MS  Value reported is 1/2 MDL substituted.  
MX  Matrix Effect
ND  No Value Detected, Zero Reported  
NS  Influenced by nearby source  
QP  Pressure Sensor Questionable
QT  Temperature Sensor Questionable
QX  Does not meet QC criteria  
SQ  Values Between SQL and MDL  
SS  Value substituted from secondary monitor  
SX  Does Not Meet Siting Criteria
TB  Trip Blank Value Above Acceptable Limit
TT  Transport Temperaure is Out of Specs.
V   Validated Value  
VB  Value below normal; no reason to invalidate  
W   Flow Rate Average out of Spec.
X   Filter Temperature Difference or Average out of Spec.
Y   Elapsed Sample Time out of Spec.

8   QA/QC Unknown (Not Active)
PQ  Values Between PQL And MDL (Not Active)
T   Multiple PM2.5 Validity Flags (Not Active)


Null Data Codes (All still active)
Required when submitting a null (i.e., nothing was collected) sample measurement; All Null 
qualifiers are available for every parameter

1C  A 1-Point QC check exceeds acceptance criteria but there is compelling evidence that 
    the analyzer data is valid.  
AA  Sample Pressure out of Limits (Legacy=9967)
AB  Technician Unavailable (Legacy=9968)
AC  Construction/Repairs in Area (Legacy=9969)
AD  Shelter Storm Damage (Legacy=9970)
AE  Shelter Temperature Outside Limits (Legacy=9971)
AF  Scheduled but not Collected (Legacy=9972)
AG  Sample Time out of Limits (Legacy=9973)
AH  Sample Flow Rate or CV out of Limits (Legacy=9974)
AI  Insufficient Data (cannot calculate) (Legacy=9975)
AJ  Filter Damage (Legacy=9976)
AK  Filter Leak (Legacy=9977)
AL  Voided by Operator (Legacy=9978)
AM  Miscellaneous Void (Legacy=9979)
AN  Machine Malfunction (Legacy=9980)
AO  Bad Weather (Legacy=9981)
AP  Vandalism (Legacy=9982)
AQ  Collection Error (Legacy=9983)
AR  Lab Error (Legacy=9984)
AS  Poor Quality Assurance Results (Legacy=9985)
AT  Calibration (Legacy=9986)
AU  Monitoring Waived (Legacy=9987)
AV  Power Failure (Legacy=9988)
AW  Wildlife Damage (Legacy=9989)
AX  Precision Check (Legacy=9990)
AY  Q C Control Points (zero/span) (Legacy=9991)
AZ  Q C Audit (Legacy=9992)
BA  Maintenance/Routine Repairs (Legacy=9993)
BB  Unable to Reach Site (Legacy=9994)
BC  Multi-point Calibration (Legacy=9995)
BD  Auto Calibration (Legacy=9996)
BE  Building/Site Repair (Legacy=9997)
BF  Precision/Zero/Span (Legacy=9998)
BG  Missing ozone data not likely to exceed level of standard (Legacy=9966)
BH  Interference/co-elution/misidentification (Legacy=9965)
BI  Lost or damaged in transit (Legacy=9964)
BJ  Operator Error (Legacy=9963)
BK  Site computer/data logger down (Legacy=9962)
BL  QA Audit (Legacy=9961)
BM  Accuracy check (Legacy=9960)
BN  Sample Value Exceeds Media Limit (Legacy=9947)
BR  Sample Value Below Acceptable Range
CS  Laboratory Calibration Standard (Legacy=9953)
DA  Aberrant Data (Corrupt Files, Aberrant Chromatography, Spikes, Shifts) (Legacy=9951)
DL  Detection Limit Analyses (Legacy=9949)
EC  Exceeds Critical Criteria
FI  Filter Inspection Flag (Legacy=9959)
MB  Method Blank (Analytical) (Legacy=9955)
MC  Module End Cap Missing (Legacy=9958)
QV  Quality Control Multi-point Verification
SA  Storm Approaching (Legacy=9957)
SC  Sampler Contamination (Legacy=9948)
ST  Calibration Verification Standard (Legacy=9954)
SV  Sample Volume out of limits
TC  Component Check & Retention Time Standard (Legacy=9952)
TS  Holding Time Or Transport Temperature Is Out Of Specs. (Legacy=9956)
XX  Experimental Data (Legacy=9950)


Informational Only Data Codes 
Informational qualifiers are used in place of a REQuest EXClusion qualifier; use only when 
an exclusion of the data will not be requested

IA  African Dust  
IB  Asian Dust  
IC  Chem. Spills & Indust Accidents  
ID  Cleanup After a Major Disaster  
IE  Demolition  
IF  Fire - Canadian  
IG  Fire - Mexico/Central America  
IH  Fireworks  
II  High Pollen Count  
IJ  High Winds  
IK  Infrequent Large Gatherings  
IL  Other  
IM  Prescribed Fire  
IN  Seismic Activity  
IO  Stratospheric Ozone Intrusion  
IP  Structural Fire  
IQ  Terrorist Act  
IR  Unique Traffic Disruption  
IS  Volcanic Eruptions  
IT  Wildfire-USA  
J   Construction  

A   High Winds (Not Active)  
B   Stratospheric Ozone Intrusion (Not Active)  
C   Volcanic Eruption (Not Active)  
D   Sandblasting (Not Active)  
F   Structural Fire (Not Active)  
G   High Pollen Count (Not Active)  
H   Chem. Spills & Indust. Accidents (Not Active)  
I   Unusual Traffic Congestion (Not Active)  
IU  Wildland Fire Use Fire-USA (Not Active)  
K   Agricultural Tilling (Not Active)  
L   Highway Construction (Not Active)  
M   Rerouting of Traffic (Not Active)  
N   Sanding/Salting of Streets (Not Active)  
O   Infrequent Large Gatherings (Not Active)  
P   Roofing Operations (Not Active)  
Q   Prescribed Burning (Not Active)  
R   Cleanup After a Major Disaster (Not Active)  
S   Seismic Activity (Not Active)  
U   Sahara Dust (Not Active)  
Z   Other event (Not Active)  

MISSING DATA FILL = EMPTY FIELD

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EXTRA DETAILS

