Maryland Heights

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: Monthly April through October.

National Ambient Air Monitoring 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.

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
2005 10 .111 .097 .088
2006 3 .111 .092 .084
2007 10 .116 .103 .094
2008
FIRST QUARTER not available not available not available not available
SECOND QUARTER not available
THIRD QUARTER not available

Graph of Recent Ozone (O3) Data
Graph of O3 PPM.


Nitrogen Dioxide (NO2)

Updated: Monthly.

National Ambient Air Monitoring 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.

The units for all averages in this chart are parts per million.
YEAR NUMBER OF EXCEEDANCES ANNUAL AVERAGE MAXIMUM
1-HOUR AVERAGE
2005 0 .0101 .046
2006 0 .0089 .256
2007 0 .0081 .058
2008
THROUGH
FIRST QUARTER
not available not available not available

Graph of Recent Nitrogen Dioxide (NO2) Data
Graph of NO2 PPM.


Sulfur Dioxide (SO2)

Updated: Monthly.

National Ambient Air Monitoring Standard: A three-hour average of 0.50 ppm (parts per million) and/or a 24-hour average of 0.14 ppm (parts per million) and/or an annual average of 0.03 ppm (parts per million). Data reported in three decimal places must be rounded to two decimal places.

Exceedances allowed without a violation being recorded: One per year.

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.

The units for all averages in this chart are parts per million.
YEAR NUMBER OF EXCEEDANCES ANNUAL AVERAGE MAXIMUM
24-HOUR AVERAGE
MAXIMUM
3-HOUR AVERAGE
MAXIMUM
1-HOUR AVERAGE
2005 0 .0025 .009 .035 .056
2006 0 .0027 .012 .034 .045
2007 0 .0027 .013 .030 .042
2008
FIRST QUARTER not available not available not available not available not available
SECOND QUARTER not available
THIRD QUARTER not available

Graph of Recent Sulfur Dioxide (SO2) Data
graph of SO2 concentration

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