Site Operator: Missouri Department of Natural Resources' Environmental Services Program.
County: Saint Louis Site ID: 29-189-0005
Pollutants Monitored: Ozone (O3)
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.
|Year||Number of Days
|This site came under control of Missouri Department of Natural Resources' Environmental Services Program on October 1, 2011.|