Weidman Rd., Queeny Park

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 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
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)

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

Nitrogen Dioxide (NO2)

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

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

Exceedances allowed without a violation being recorded: None.

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)

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

Sulfur Dioxide (SO2)

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

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.

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
1993	0	.009	.039	.082	.180
1994	0	.007	.031	.082	.177
1995	0	.004	.019	.070	.104
1996	0	.004	.024	.076	.170
1997	0	.004	.042	.180	.240
1998	0	.003	.030	.095	.142
1999	0	.004	.017	.061	.092
2000	0	.003	.017	.041	.061
2001	0	.003	.013	.048	.099
2002	0	.0026	.015	.044	.085
2003	0	.0024	.016	.033	.055
2004	0	.0026	.017	.035	.045
2005	0	.0025	.015	.043	.050
2006(site shut down)

Graph of Recent Sulfur Dioxide (SO2) Data