Table Name,METDATA
Table Description,2009
Number of Records,2025-08-26
Last Table Update,2023-04-24
File Date,735706
Note 1,Data having a QA_CODE of less than 3 is preliminary and subject to change.
Data Codes Contained in File:
COLUMN_NAME,CODE,DESCRIPTION,VALIDITY
%_F,&,Ambient concentration data measured/collected coincident with data flagged A,Invalid
%_F,<,Missing < 25% of hourly sampling period,Invalid
%_F,A,Anomalous value resulting from local anthropogenic activity,Invalid
%_F,B,Field instrument channel down for > 75% of hourly sampling period,Valid
%_F,C,Invalid data collected during field calibration of instrument,Valid
%_F,D,Field instrument channel down for 25% to 75% of hourly sampling period,Valid
%_F,E,Exceptional event designation requested by state agency,Invalid
%_F,F,Field instrument power failure,Valid
%_F,H,Invalid reading - related to instrument malfunction,Valid
%_F,I,Invalid reading - Suspect data,Valid
%_F,J,Invalid reading - related to critical criteria failures,Valid
%_F,K,Non-nominal flow value identified during automated screening,Invalid
%_F,M,Field data missing,Valid
%_F,NULL,Valid data,Invalid
%_F,O,Value estimated or assumed,Invalid
%_F,P,Potential problem identified during automated screening requiring further investigation,Valid
%_F,Q,Wind direction is a scalar value,Invalid
%_F,S,Field instrument out of DQO at time of 2nd calibration,Invalid
%_F,T,Third party audit,Valid
%_F,W,Temperature Blower Motor Status Failure,Invalid
%_F,Y,QC Control Points (zero/span),Invalid
%_F,^,Alarm high -- ozone > 120,Invalid
%_F,_,Field reading less than zero,Invalid
OZONE_F,<,Missing < 25% of hourly sampling period,Invalid
OZONE_F,B,Field instrument channel down for > 75% of hourly sampling period,Valid
OZONE_F,C,Invalid data collected during field calibration of instrument,Valid
OZONE_F,D,Field instrument channel down for 25% to 75% of hourly sampling period,Valid
OZONE_F,E,Exceptional event designation requested by state agency,Invalid
OZONE_F,F,Field instrument power failure,Valid
OZONE_F,H,Invalid reading - related to instrument malfunction,Valid
OZONE_F,I,Invalid reading - Suspect data,Valid
OZONE_F,J,Invalid reading - related to critical criteria failures,Valid
OZONE_F,K,Non-nominal flow value identified during automated screening,Invalid
OZONE_F,M,Field data missing,Valid
OZONE_F,NULL,Valid data,Invalid
OZONE_F,P,Potential problem identified during automated screening requiring further investigation,Valid
OZONE_F,S,Field instrument out of DQO at time of 2nd calibration,Invalid
OZONE_F,T,Third Party Audit,Valid
OZONE_F,Y,QC control points (zero/span),Valid
OZONE_F,^,Alarm high -- ozone > 120,Invalid
OZONE_F,_,Field reading less than zero,Invalid
QA_CODE,0,Level 0 validated data,
QA_CODE,1,Level 1 validated data,
QA_CODE,1X,Level 1 data that are suspect based on manual screening.  Data should be omitted from any statistical analyses.,
QA_CODE,2,Level 2 validated data,
QA_CODE,3,Level 3 validated data,
QA_CODE,GS,Government shutdown period,
QA_CODE,X,Record not obtained via daily polling; placeholder used,
