Address: 15797 Highway D
Bonne Terre, MO 63628
County: Ste. Genevieve
Site established: April 1, 1996
Pollutant monitored: Ozone (O3)
Pollutants monitored in the past: Nitrogen dioxide (NO2) and fine particulate matter (PM2.5)
(Click to submit a request for records.)
Site coordinates
Latitude: 37.90084°
* Longitude: -90.42388°
EPA Site No.: 29-186-0005

Established in 1996, the air monitoring station in Bonne Terre is one of the oldest that the state still operates. Bonne Terre's design value for ozone peaked at 90 parts per billion (ppb) during the 1998-2000 monitoring period.

Ozone Data*

The season for monitoring ground-level ozone runs from March 1 to 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 ground-level ozone standard is 70 parts per billion (ppb), which equals 0.070 parts per million (ppm). 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 season
• Running list of exceedances from beginning of ozone season
• Monthly number of exceedances, 2016 and 2017
• Daily maximum average eight-hour concentrations for each site from beginning of season

Preliminary one-hour averages in parts per million from Bonne Terre
• "P" stands for primary monitor; "S" for secondary monitor.
• Data from 10 days ago through current date
• Central Standard Time

Preliminary eight-hour forward-rolling averages in parts per million from all 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

Preliminary one-hour ozone averages from all sites

• Data from 10 days ago through current date
• Central Standard Time
• Concentration of ozone in parts per million (ppm)

Ozone design values for Bonne Terre, 1996-2002

Ozone design values for outstate sites, beginning in 2003

2016 list of exceedances from all ozone sites

* Technical issues can affect ability to delivery quality data.
Click to access a table of symbolsindicating problems.

Related Links

Missouri's mapped network of air monitoring sites

Real-time views from cameras in Kansas City and St. Louis

Department's webpage about ground-level ozone
• Description and health effects of ground-level ozone
• Tips to reduce ground-level ozone
• 2008 and 2015 standards plus related documents

Department's webpage about air quality
• EPA's air quality forecasts for St. Louis, Kansas City and Springfield
• Information about EPA's Air Quality Index (AQI)
• Suggestions for breathing better on action days — those forecasted orange (unhealthy for sensitive groups) to maroon (hazardous)

EPA's AirNow website
• Air quality forecasts for all parts of the country
• Pertinent links and resources

National standards for pollutants

EPA's Air Sensor Toolbox for Citizen Scientists