Hunter Avenue, Ladue

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

Pollutants Monitored : Ozone (O3), Nitrogen Dioxide (NO2), Sulfur Dioxide (SO2), Inhalable Particulate (PM2.5), Lead (Pb)


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
1993 0 .118 not available not available
1994 3 .135 not available not available
1995 0 .115 not available not available
1996 0 .113 not available not available
1997 0 .104 not available not available
1998 1 .139 not available not available
1999 1 .131 not available not available
2000 0 .110 not available not available
2001 0 .096 not available not available
2002 15 .114 .105 .094
2003 3 .138 .106 .082
2004 0 .091 .072 .067
(Instrument removed from site in late 2004)


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
1993 0 .021 .326
1994 0 .023 .089
1995 0 .022 .090
1996 0 .022 .080
1997 0 .022 .071
1998 0 .023 .097
1999 0 .024 .087
2000 0 .021 .072
2001 0 .020 .095
2002 0 .020 .101
2003 0 .018 .089
2004 0 .0172 .055
2005 0 .0168 .061
2006 0 .0153 .060
2007 0 .0132 .052
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
1993 0 .008 .026 .065 .081
1994 0 .009 .026 .074 .128
1995 0 .007 .024 .115 .128
1996 0 .007 .033 .092 .124
1997 0 .007 .045 .103 .141
1998 0 .007 .033 .098 .236
1999 0 .006 .026 .103 .160
2000 0 .005 .028 .049 .073
2001 0 .004 .015 .034 .068
2002 0 .0036 .016 .049 .080
2003 0 .0045 .017 .056 .073
2004 0 .0033 .023 .039 .068
2005 0 .0032 .017 .050 .070
2006 0 .0028 .014 .050 .070
2007 0 .0030 .014 .035 .061
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 PPM.


Inhalable Particulate (PM2.5)

Updated: Within 90 days after the end of a quarter.

National Ambient Air Monitoring Standard: (24-hour samples; one taken every third day)  A three year average of the 98th percentile 24-hour averages equal or greater than 35 ug/m3 (micrograms per cubic meter) and/or a three year average of annual averages equal or greater than 15.0 ug/m3 (micrograms per cubic meter).

Exceedances allowed without a violation being recorded: two percent of daily observations

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 micrograms per cubic meter.
YEAR FIRST MAXIMUM
24-HOUR
AVERAGE
SECOND MAXIMUM
24-HOUR
AVERAGE
ANNUAL
AVERAGE
1999 46.7 45.3 13.98
2000 34.1 33.4 14.83
2001 36.0 33.8 13.9
2002 38.7 38.6 14.6
2003 48.3 39.2 13.6
2004 39.7 33.7 12.24
2005 44.2 43.6 16.44
2006 32.1 30.8 11.76
2007 45.8 41.9 13.09
2008
THROUGH
FIRST QUARTER
not available not available not available

Graph of Recent PM 2.5 Real Time Data
Graph of PM2.5 TEOM PPM.


Lead (Pb)

Updated: Within 90 days after the end of a quarter.

National Ambient Air Monitoring Standard: (24-hour samples; one taken every sixth day) A three-month average of 1.5 ug/m3 (micrograms per cubic meter).

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 micrograms per cubic meter.
YEAR NUMBER
OF
EXCEEDANCES
MAXIMUM
3-MONTH
AVERAGE
MAXIMUM
24-HOUR
AVERAGE
1993 0 .02 .16
1994 0 .02 .13
1995 0 .02 .14
1996 0 .02 .17
1997 0 .01 .13
1998 0 .03 .22
1999 0 .02 .11
2000 0 .01 .01
2001 0 .01 .13
2002 0 .01 .01
2003 0 .01 .01
2004 0 .05 .05
2005 0 .05 .05
2006 0 .05 .05
2007 0 .05 .05
2008
FIRST QUARTER not available not available not available
SECOND QUARTER not available not available
THIRD QUARTER not available not available

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