Address: Highway 33 and County Home Rd.
Liberty, MO 64068
County: Clay
Pollutants monitored: Ozone (O3) and fine particulate matter (PM2.5)
Pollutants no longer monitored: Nitrogen dioxide (NO2), particulate matter (PM10), and PM2.5 speciation
(To request information, click here.)
Date established: Jan. 1, 1980
Site coordinates
* Latitude: 39.30314°
* Longitude: -92.37678°
EPA site ID: 29-047-0005

The Liberty air monitoring station helps characterize exposure to ground-level ozone and fine particulate matter of a segment of the Kansas City metropolitan statistical area. In the past, the station has monitored other pollutants; for example, it monitored nitrogen dioxide from 1982 to 2010.

Ozone (O3) Data*

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 (ppb), or 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 ozone season
• Running list of exceedances from beginning of season
• Monthly number of exceedances, 2016 and 2017
• Daily maximum average eight-hour concentration for each site from beginning of season

Preliminary one-hour averages in parts per million from the Liberty site
• Ozone data in first and second columns
• "P" stands for primary monitor, and "S" stands for secondary monitor.
• Data from 10 days ago through current date
• Central Standard Time

Preliminary eight-hour forward-rolling average concentrations 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 in parts per million

Preliminary one-hour averages of ozone concentrations in parts per million, all sites

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

Department's web page 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

Graph of ozone design values for sites in Kansas City area, beginning in 2003

2016 list of exceeedances

* Technical issues can affect ability to delivery quality data.
Access a table of symbols indicating problems.

Fine Particulate Matter (PM2.5) Data*

Fine particulate matter describes inhalable particles with a diameter of 2.5 micrometers and smaller. They are only visible with an electron microscope. They come from all types of combustion, such as fires, industrial processes and the operation of motor vehicles and power plants. They are so small that they can become entrenched in one's lungs, causing health problems.

EPA uses two ways to determine compliance with PM2.5 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 long-time standard for 24-hour Pm2.5 is 35 micrograms per cubic meter, based on the 98th percentile of 24-hour measurements, averaged over three years.

Weekly summary of preliminary data from all PM2.5 sites

Preliminary one-hour averages from Liberty

• Data about PM2.5 is in the sixth column
• Data from 10 days ago through current date
• Central Standard Time

Preliminary one-hour averages from all PM2.5 sites

• Data from past three days through current date
• Central Standard Time

Graph of PM2.5 annual design values from Kansas City sites, beginning in 2003

Graph of PM2.5 24-hour design values from Kansas City sites, beginning in 2003

Department webpage about particulate matter
• Description and health effects
• Standards from 1997, 2006 and 2012 as well as related documents

* Technical issues can affect ability to delivery quality data.
Access a table of symbols indicating problems.

Related Links

Missouri's mapped network of air monitoring sites

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

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

EPA's airnow.gov/ webpage
• Air quality forecasts for entire country
• EPA links to related information

EPA's Air Sensor Toolbox for Citizen Scientists