The El Dorado Springs station monitors ground-level ozone and fine particulate matter. It is not close to urban areas or large air pollution sources, so it provides information on regional background levels of the monitored air pollutants and tracks attainment of the national ambient air quality standards (NAAQS). Pollutants historically monitored at this site include nitrogen dioxide from 1998-2003.


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
  • 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, 2021 and 2022
  • Daily maximum average eight-hour concentration for each site from beginning of season
  • Map of Missouri's ozone monitoring sites

Fine Particulate Matter (PM 2.5)

Departmental information about particulate matter (PM)

  • Description of two groups of particulate matter: PM2.5 and PM10
  • 1997, 2006 and 2012 standards for PM2.5 plus related documents
  • 2006 PM10 standard and pertinent documents
  • Annual PM2.5 design values
  • 24-Hour PM2.5 design values
  • Map of PM2.5 sites
El Dorado Springs Air Monitoring Site

Hwy 97 and Barnes Road
El Dorado Springs, MO 64744
United States

Date Established
Pollutants Monitored
Particulate Matter
37.70097, -94.03474