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.

Inhalable Particulate (PM2.5)

The units for all averages in this chart are micrograms per cubic meter.
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 50.9 24. 10.76
Data from 2013 on is from a continiously operated TEOM DF.
2013
Through Second Quarter 30.9 24.2 11.43

Ladue air monitoring site


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.

Ozone (O3)

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 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.

 

Nitrogen Dioxide (NO2)

The units for all averages in this chart are parts per million.
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.

Sulfur Dioxide (SO2)

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 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

 

Beginning | Index | Current Data | Site Map | St. Louis Data