Environmental Services Program
Ladue, Hunter Avenue, St. Louis
Site Operator: Missouri Department of Natural Resources' Environmental Services Program.
Pollutants Monitored : Inhalable Particulate (PM2.5)
Inhalable Particulate (PM2.5)
Updated: Quarterly.
National Ambient Air Monitoring Standard: A three-year average of the 98th percentile of 24-hour averages equal to or greater than 35 ug/m3 (micrograms per cubic meter)
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
Yearly and quarterly data shown below has been subject to data review and validation procedures by the reporting agency.
| Year | First Maximum 24-Hour Average |
98th Percentile Value | Annual Average |
|---|---|---|---|
| Third and Fourth Quarter 2009 Data from the TEOM Hunter Avenue (Ladue) | |||
| 2009 | 28.6 | 24.1 | 11.06 |
| 2010 | 38.3 | 26.7 | 11.21 |
| 2011 | 49.5 | 26.8 | 10.61 |
| This site came under control of Missouri Department of Natural Resources on October 1, 2011. | |||
| 2012 | |||
| Through Third Quarter | 50.9 | 22.6 | 10.38 |
Inactive Pollutants
Ozone (O3)
Updated: Only historical data is shown. Insturment was shutdown in 2004.
National Ambient Air Monitoring Standard:
Eight-hour Standard
The three-year average of the fourth highest daily maximum eight-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.
One-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 eight-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 |
|---|---|---|---|---|
| 1993 | 0 | 0.118 | not available | not available |
| 1994 | 3 | 0.135 | not available | not available |
| 1995 | 0 | 0.115 | not available | not available |
| 1996 | 0 | 0.113 | not available | not available |
| 1997 | 0 | 0.104 | not available | not available |
| 1998 | 1 | 0.139 | not available | not available |
| 1999 | 1 | 0.131 | not available | not available |
| 2000 | 0 | 0.110 | not available | not available |
| 2001 | 0 | 0.096 | not available | not available |
| 2002 | 15 | 0.114 | 0.105 | 0.094 |
| 2003 | 3 | 0.138 | 0.106 | 0.082 |
| 2004 | 0 | 0.091 | 0.072 | 0.067 |
| Instrument removed from site November 2004 | ||||
Nitrogen Dioxide (NO2)
Updated: Only historical data is shown. Insturment was shutdown in October 2010.
National Ambient Air Monitoring Standard:
24-hour average of 0.14 ppm (parts per million) equivalent to 140 ppb (parts per billion).
Annual average of 0.03 ppm equivalent to 30 ppb.
The three-year average of the 99th percentile of the daily maximum one-hour average must not exceed 75 ppb to be in compliance of the one-hour standard.
Exceedances allowed without a violation being recorded: One per year of the 24-hour average, all others are recorded with the first violation.
Yearly and quarterly data shown below has been subject to data review and validation procedures by the reporting agency.
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 |
|---|---|---|---|
| 1993 | 0 | 0.021 | 0.326 |
| 1994 | 0 | 0.023 | 0.089 |
| 1995 | 0 | 0.022 | 0.090 |
| 1996 | 0 | 0.022 | 0.080 |
| 1997 | 0 | 0.022 | 0.071 |
| 1998 | 0 | 0.023 | 0.097 |
| 1999 | 0 | 0.024 | 0.087 |
| 2000 | 0 | 0.021 | 0.072 |
| 2001 | 0 | 0.020 | 0.095 |
| 2002 | 0 | 0.020 | 0.101 |
| 2003 | 0 | 0.018 | 0.089 |
| 2004 | 0 | 0.0172 | 0.055 |
| 2005 | 0 | 0.0168 | 0.061 |
| 2006 | 0 | 0.0153 | 0.060 |
| 2007 | 0 | 0.0132 | 0.052 |
| 2008 | 0 | 0.0138 | 0.051 |
| 2009 | 0 | 0.0115 | 0.045 |
| 2010 | |||
| Through Third Quarter |
0 | 0.0115 | 0.047 |
| Instrument shut down October 2010 | |||
Sulfur Dioxide (SO2)
Updated: Only historical data is shown. Insturment was shutdown in October 2010.
National Ambient Air Monitoring Standard: New standard effective August 22, 2010.
24-hour average of 0.14 ppm (parts per million) equivalent to 140 ppb (parts per billion).
Annual average of 0.03 ppm equivalent to 30 ppb.
The three-year average of the 99th percentile of the daily maximum one-hour average must not exceed 75 ppb to be in compliance of the one-hour standard.
Exceedances allowed without a violation being recorded: One per year of the 24-hour average, all others are recorded with the first violation.
Disclaimer: Yearly and quarterly data shown below has been subject to data review and validation procedures by the reporting agency.
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 |
|---|---|---|---|---|---|
| 1993 | 0 | 0.008 | 0.026 | 0.065 | 0.081 |
| 1994 | 0 | 0.009 | 0.026 | 0.074 | 0.128 |
| 1995 | 0 | 0.007 | 0.024 | 0.115 | 0.128 |
| 1996 | 0 | 0.007 | 0.033 | 0.092 | 0.124 |
| 1997 | 0 | 0.007 | 0.045 | 0.103 | 0.141 |
| 1998 | 0 | 0.007 | 0.033 | 0.098 | 0.236 |
| 1999 | 0 | 0.006 | 0.026 | 0.103 | 0.160 |
| 2000 | 0 | 0.005 | 0.028 | 0.049 | 0.073 |
| 2001 | 0 | 0.004 | 0.015 | 0.034 | 0.068 |
| 2002 | 0 | 0.0036 | 0.016 | 0.049 | 0.080 |
| 2003 | 0 | 0.0045 | 0.017 | 0.056 | 0.073 |
| 2004 | 0 | 0.0033 | 0.023 | 0.039 | 0.068 |
| 2005 | 0 | 0.0032 | 0.017 | 0.050 | 0.070 |
| 2006 | 0 | 0.0028 | 0.014 | 0.050 | 0.070 |
| 2007 | 0 | 0.0030 | 0.014 | 0.035 | 0.061 |
| 2008 | 0 | 0.0025 | 0.011 | 0.038 | 0.051 |
| 2009 | 0 | 0.0026 | 0.015 | 0.038 | 0.067 |
| 2010 | |||||
| First Quarter | 0 | 0.0027 | 0.012 | .027 | 0.049 |
| Second Quarter | 0 | ||||
| Third Quarter | 0 | ||||
| Instrument shut down October 2010 | |||||
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