Margaretta
Site Operator: St. Louis City, Division of Air Pollution Control, Technical Services Section
Pollutants Monitored: Ozone (O3), Nitrogen Dioxide (NO2), Sulfur Dioxide (SO2), Carbon Monoxide (CO), Inhalable Particulate (PM10), Inhalable Particulate (PM2.5)
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.
| YEAR | NUMBER OF DAYS OVER STANDARD | MAXIMUM 1-HOUR AVERAGE |
MAXIMUM 8-HOUR AVERAGE |
Fourth MAXIMUM 8-HOUR AVERAGE |
| 2000 | 0 | .111 | not available | not available |
| 2001 | 0 | .103 | not available | not available |
| 2002 | 17 | .124 | .111 | .098 |
| 2003 | 5 | .141 | .116 | .090 |
| 2004 | 0 | .104 | .077 | .072 |
| 2005 | 9 | .111 | .096 | .091 |
| 2006 | 0 | .099 | .084 | .076 |
| 2007 | 6 | .133 | .113 | .091 |
| 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
Updated: Within 90 days after the end of a quarter.
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.
| YEAR | NUMBER OF EXCEEDANCES |
ANNUAL AVERAGE |
MAXIMUM 1-HOUR AVERAGE |
| 2000 | 0 | .021 | .081 |
| 2001 | 0 | .020 | .084 |
| 2002 | 0 | .0206 | .087 |
| 2003 | 0 | .0188 | .075 |
| 2004 | 0 | .0176 | .068 |
| 2005 | 0 | .0154 | .070 |
| 2006 | 0 | .0151 | .074 |
| 2007 | 0 | .0151 | .067 |
| 2008 | |||
| THROUGH FIRST QUARTER |
not available | not available | not available |
Graph of Recent Nitrogen Dioxide (NO2) Data
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.
| YEAR | NUMBER OF EXCEEDANCES |
ANNUAL AVERAGE | MAXIMUM 24-HOUR AVERAGE |
MAXIMUM 3-HOUR AVERAGE |
MAXIMUM 1-HOUR AVERAGE |
| 2000 | 0 | .005 | .022 | .042 | .080 |
| 2001 | 0 | .006 | .019 | .057 | .140 |
| 2002 | 0 | .0049 | .026 | .057 | .086 |
| 2003 | 0 | .0045 | .016 | .051 | .066 |
| 2004 | 0 | .0039 | .024 | .060 | .112 |
| 2005 | 0 | .0045 | .021 | .060 | .112 |
| 2006 | 0 | .0038 | .015 | .049 | .074 |
| 2007 | 0 | .0036 | .015 | .043 | .072 |
| 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
Updated: Monthly.
National Ambient Air Monitoring Standard: A one-hour average of 35 ppm (parts per million) and/or an eight-hour average of 9 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.
| YEAR | NUMBER OF EXCEEDANCES |
MAXIMUM 8-HOUR AVERAGE |
MAXIMUM 1-HOUR AVERAGE |
| 2000 | 0 | 4.6 | 5.8 |
| 2001 | 0 | 6.6 | 8.1 |
| 2002 | 0 | 3.6 | 5.8 |
| 2003 | 0 | 3.1 | 4.9 |
| 2004 | 0 | 3.3 | 4.9 |
| 2005 | 0 | 4.2 | 5.1 |
| 2006 | 0 | 2.5 | 4.3 |
| 2007 | 0 | 2.7 | 4.3 |
| 2008 | |||
| FIRST QUARTER | not available | not available | not available |
| SECOND QUARTER | not available | ||
| THIRD QUARTER | not available | ||
Graph of Recent Carbon Monoxide (CO) Data
Updated: Within 90 days after the end of a quarter.
National Ambient Air Monitoring Standard: (24-hour samples; one taken every sixth day) A 24-hour average of 150 ug/m3 (micrograms per cubic meter) and/or an annual average of 50 ug/m 3 (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.
| YEAR | NUMBER OF EXCEEDANCES |
ANNUAL AVERAGE |
MAXIMUM 24-HOUR AVERAGE |
| 2000 | 0 | 30 | 105 |
| 2001 | 0 | 24 | 75 |
| 2002 | 0 | 22 | 64 |
| 2003 | 0 | 23 | 49 |
| 2004 | 0 | 20 | 45 |
| 2005 | 0 | 26.6 | 53 |
| 2006 | 0 | 19.7 | 55 |
| 2007 | 0 | 21.6 | 66 |
| 2008 | |||
| THROUGH FIRST QUARTER |
not available | not available | not available |
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.
| YEAR | FIRST MAXIMUM 24-HOUR AVERAGE |
SECOND MAXIMUM 24-HOUR AVERAGE |
ANNUAL AVERAGE |
| 1999 | 49.4 | 49.3 | 15.4 |
| 2000 | 41.8 | 40.2 | 14.94 |
| 2001 | 41.8 | 40.2 | 14.94 |
| 2002 | 73.5 | 58.2 | 14.3 |
| 2003 | 49.9 | 42.3 | 13.5 |
| 2004 | 42.1 | 31.5 | 12.11 |
| 2005 | 43.4 | 41.5 | 15.14 |
| 2006 | 31.7 | 30.8 | 12.47 |
| 2007 | 36.3 | 34.2 | 13.14 |
| 2008(removed from site) | |||
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