Site Operator: St. Louis County Department of Health, Air Pollution Monitoring Program

Pollutants Monitored: Ozone (O3), Nitrogen Dioxide (NO2), Sulfur Dioxide (SO2)


Ozone (O3)

Updated: Only historical data shown below. Site has been discontinued.

National Ambient Air Quality Standard:

8-hour Standard
The three-year average of the fourth highest daily maximum 8-hour average must not be greater than .08 ppm (parts per million). Data reported in three decimal places must be rounded to two decimal places.

1-hour Standard 1970 to 1997-no longer applies to any area in Missouri.
A one-hour average of 0.12 ppm (parts per million).

Exceedances allowed without a violation being recorded:
The term exceedance does not apply to the 8-hour standard. The three-year average is used to determine designation of attainment or non-attainment.

Disclaimer: Yearly and quarterly data shown below has been subject to data review and validation procedures by the reporting agency. Monthly data and data shown graphically is raw, unreviewed and unvalidated data.

Ozone (O3)

The units for all averages in this chart are parts per million.
Year Number of Days
Over Standard
Maximum
1-Hour Average
Maximum
8-Hour Average
Fourth Maximum
8-Hour Average
1993 0 .109 not available not available
1994 5 .164 not available not available
1995 1 .131 not available not available
1996 0 .121 not available not available
1997 0 .102 not available not available
1998 1 .148 not available not available
1999 1 .136 not available not available
2000 0 .124 not available not available
2001 0 .101 not available not available
2002 10 .114 .098 .094
2003 4 .114 .097 .086
2004 0 .084 .076 .070
2005 0 .108 .098 .082
2006(site shut down)


Nitrogen Dioxide (NO2)

Updated: Only historical data shown below. Site has been discontinued.

National Ambient Air Quality Standard: An annual average of 0.053 ppm (parts per million).

Exceedances allowed without a violation being recorded: None.

Disclaimer: Yearly and quarterly data shown below has been subject to data review and validation procedures by the reporting agency. Monthly data and data shown graphically is raw, unreviewed and unvalidated data.

Nitrogen Dioxide (NO2)

The units for all averages in this chart are parts per million.
Year Number of
Exceedances
Annual
Average
Maximum
1-Hour Average
1993 0 .012 .077
1994 0 .014 .065
1995 0 .012 .079
1996 0 .013 .074
1997 0 .013 .063
1998 0 .013 .066
1999 0 .014 .074
2000 0 .012 .062
2001 0 .012 .056
2002 0 .011 .058
2003 0 .010 .050
2004 0 .0097 .050
2005 0 .0102 .051
2006(site shut down)


 

 

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