El Dorado Springs Missouri Air Monitoring Station

Address: Highway 97 and Barnes Road
El Dorado Springs, MO 64744
County: Cedar
Pollutant monitored: Ozone (O3) and fine particulate matter (PM2.5)
Pollutants no longer monitored: Nitrogen dioxide (NO2) and particulate matter (PM10). The El Dorado Springs monitor also is no longer part of IMPROVE, which stands for Interagency Monitoring of Protected Visual Environments. It focuses on improving visibility in wilderness areas.
Date established: 08/01/1998

El Dorado Springs Missouri Air Monitoring Station
Site coordinates
* Latitude: 37.70097°
* Longitude: -94.03474°
EPA site ID: 29-039-0001

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.

The federal ozone season runs from March 1 through October 31.
Ground-level ozone forms when pollutants emitted by cars, factories, power plants and other sources react chemically in the presence of heat and sunlight. Ozone at ground level is a harmful air pollutant as opposed to ozone in the upper atmosphere, which protects us from ultraviolet light.

As of 2015, the federal standard for ground-level ozone is 70 parts per billion, or 0.070 parts per million. An area is in compliance if the design value is at or below this standard. A design value for ozone incorporates data from three years. The department and EPA calculate the design value by 1) ranking the daily eight-hour ozone values for three consecutive years; 2) extracting the fourth-highest value for each year; and 3) averaging the three figures.

Weekly summary of preliminary data from all ozone sites
• 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, 2016 and 2017
• Highest daily eight-hour average concentration for each site from beginning of season

Preliminary one-hour ozone data from El Dorado Springs

• Ozone data in third and four columns
• "P" stands for primary monitor. "S" stands for secondary monitor.
• Data from 10 days ago through current date
• Central Standard Time

Preliminary eight-hour forward-rolling averages from all ozone sites
• Hourly data equal to average of that hour and the following seven hours
• Data from 10 days ago through current date
• Central Standard Time
• Concentrations of ozone in parts per million (ppm)

Preliminary one-hour ozone averages in parts per million from all sites

• Data from 10 days ago through current date
• Central Standard Time

Graph of ozone design values for outstate sites, beginning in 2003

Department webpage about ground-level ozone
• Description and health effects
• 2008 and 2015 standards and related documents

*Technical issues can affect ability to deliver quality data.
Click to access a table of symbols indicating technical issues.

EPA uses two ways to determine compliance with PM2.5 federal standards. One looks at data over a 24-hour period,
and the other takes into account data from a whole year. As of 2012, the annual PM2.5 standard is 12 micrograms per cubic meter, based on the three-year average of annual means. The 24-hour standard dates to 2006; it corresponds to the 98th percentile of 24-hour measurements, averaged over three years.

Weekly summary of preliminary data from all PM2.5 sites

Preliminary one-hour data from El Dorado Springs
• PM2.5 data in seventh column
• Data from 10 days ago through current date
• Central Standard Time

Preliminary one-hour averages from all PM2.5 sites
• Data from four days ago through current date
• Central Standard Time

Graph of 24-hour design values from outstate areas, beginning in 2003

Graph of annual design values from outstate areas, beginning in 2003

Department webpage about particulate matter
• Description
• Standards and related documents

*Technical issues can affect ability to deliver quality data.
Click to access a table of symbols indicating technical issues.