Established in 1975, the air monitor at Watkins Mill State Park is one of the state's longest-running stations. The park lies about 40 miles northwest of the Kanas City line, and the monitor helps determine ozone exposure of a population segment in the Kansas City metropolitan statistical area. The state park is adjacent to the Watkins Woolen Mill State Historic Site. The park and historic site bear the name of entrepreneur Waltus Watkins. 

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

Ozone season runs from March 1 to October 31. Weekly updates will resume in March 2022.

  • Eight-hour ozone design values
  • Four highest eight-hour ozone values from beginning of ozone season
  • Running list of sites with exceedances from beginning of season
  • Monthly number of exceedances, 2019 and 2020
  • Daily maximum average eight-hour concentration for each site from beginning of season
  • Map of Missouri's ozone monitoring sites
Watkins Mill State Park Air Monitoring Site
Address

Watkins Mill Road
Lawson, MO 64062
United States

EPA Site ID
29-047-0003
County
Clay
Date Established
Pollutants Monitored
Ozone
Latitude/Longitude
39.407419, -94.265142