Environmental Services Program

West Alton

Site Operator: Missouri Department of Natural Resources' Environmental Services Program.

County: Saint Charles  Site ID: 29-183-1002

Pollutants Monitored: Ozone (O3)


Ozone (O3)

Updated: Quarterly

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 0.075 ppm (parts per million). To attain this standard, the three-year average of the fourth-highest daily maximum eight-hour average ozone concentrations measured at each monitor within an area over each year must not exceed 0.075 ppm.  (Effective May 27, 2008).

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 0.116 not available not available
1994 4 0.147 not available not available
1995 4 0.154 not available not available
1996 1 0.135 not available not available
1997 1 0.131 not available not available
1998 2 0.140 not available not available
1999 2 0.149 not available not available
2000 1 0.125 not available not available
2001 1 0.139 not available not available
2002 20 0.130 0.111 0.099
2003 7 0.109 0.097 0.091
2004 0 0.094 0.081 0.077
2005 11 0.122 0.101 0.089
2006 10 0.126 0.097 0.091
2007 10 0.130 0.099 0.089
2008 4 0.098 0.089 0.076
2009 2 0.096 0.081 0.071
2010 10 0.104 0.091 0.084
2011 14 0.106 0.093 0.084
2012 22 0.126 0.099 0.092
2013
Second Quarter        
Third Quarter  

Photograph of West Alton


Inactive Pollutants


Nitrogen Dioxide (NO2)

Updated: All data shown is historical this instrument was shut down September 2010.

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 0.013 0.083
1994 0 0.013 0.080
1995 0 0.011 0.057
1996 0 0.011 0.062
1997 0 0.011 0.073
1998 0 0.012 0.057
1999 0 0.012 0.066
2000 0 0.009 0.047
2001 0 0.010 0.050
2002 0 0.0096 0.043
2003 0 0.0087 0.041
2004 0 0.0082 0.044
2005 0 0.0086 0.050
2006 0 0.0083 0.050
2007 0 0.0083 0.050
2008 0 0.0066 0.044
2009 0 0.0064 0.045
2010
Through
Third Quarter
0 0.006 0.038
Instrument shut down in September 2010


Inhalable Particulate (PM2.5)

Updated: Data is historical only. Insturment has been discontinued.

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.

Inhalable Particulate (PM2.5)

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
1998 not available not available not available
1999 43.7 40.7 14.24
2000 35.2 34.8 14.89
2001 42.0 36.7 15.0
2002 40.3 38.4 14.2
2003 44.7 37.9 14.0
2004 35.8 32.4 11.89
2005 41.5 41.4 15.21
2006 31.4 27.9 11.55
2007 49.7 39.4 11.55
2008 (Instrument removed 2008)

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