Environmental Services Program

Orchard Farm

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

County: Saint Charles  Site ID: 29-183-1004

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.

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
1995 2 0.137 not available not available
1996 1 0.147 not available not available
1997 0 0.108 not available not available
1998 1 0.136 not available not available
1999 2 0.143 not available not available
2000 0 0.118 not available not available
2001 0 0.105 not available not available
2002 14 0.145 0.114 0.098
2003 6 0.119 0.097 0.090
2004 0 0.093 0.080 0.076
2005 10 0.120 0.098 0.092
2006 7 0.111 0.095 0.092
2007 3 0.111 0.095 0.083
2008 2 0.105 0.082 0.072
2009 2 0.087 0.077 0.073
2010 5 0.096 0.088 0.077
2011 7 0.103 0.081 0.078
2012 11 0.102 0.096 0.086
Year Number of Days
Over Standard
Maximum
1-Hour Average
Maximum
8-Hour Average
Fourth Maximum
8-Hour Average
2013
Second Quarter 0 0.085 0.075

0.064

Third Quarter  

Photograph of Orchard Farm

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