Environmental Services Program
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. Monthly data and data shown graphically is raw, unreviewed and unvalidated data.
|Year||Number of Days
|This site came under control of Missouri Department of Natural Resources' Environmental Services Program on October 1, 2011.|