The Orchard Farm air monitoring station is located downwind of St. Louis. It helps to characterize ozone concentrations downwind of the St. Louis area and determine exposure to ozone of the population of the St. Louis Metropolitan Statistical Area and monitor attainment or nonattainment of the ambient air quality standards.

Pollutants

Ozone Pollutant

The primary National Ambient Air Quality Standard for ozone is 0.070 parts per million averaged over eight hours (annual fourth-highest daily maximum 8-hour concentration, averaged over three years). The federal ozone season for monitoring runs from March 1 to Oct. 31.

Departmental information about ozone (O3)

  • Description
  • Health effects
  • Tips to reduce ozone
  • 2008 and 2015 standards plus related documents
Orchard Farm Air Monitoring Site
Address

2165 Hwy V
St. Charles, MO 63301
United States

EPA Site ID
29-183-1004
County
St. Charles
Date Established
Pollutants Monitored
Ozone
Latitude/Longitude
38.8994, -90.44917