Environmental Services Program

Pacific

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

County: Saint Louis      Site ID: 29-189-0005

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
Second Quarter 0 0.079 0.070 0.058
Third Quarter  
2013
2012 13 0.113 0.091 0.085
2011 1 0.097 0.081 0.070
This site came under control of Missouri Department of Natural Resources' Environmental Services Program on October 1, 2011.
2010 0 0.084 0.073 0.069
2009 0 0.086 0.072 0.064
2008 0 0.079 0.065 0.064
2007 4 0.107 0.093 0.085
2006 1 0.119 0.090 0.079
2005 5 0.107 0.099 0.087

 

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