Particulate Matter
National Trends in Particulate Matter Levels
Local Trends in Particulate Matter Levels
National Trends in Particulate Matter Levels
Using a nationwide network of monitoring sites, EPA has developed ambient air quality trends for particle pollution, also called Particulate Matter (PM). Trends from 1990-2008 are shown here for PM2.5 and PM10. Under the Clean Air Act, EPA sets and reviews national air quality standards for PM. Air quality monitors measure concentrations of PM throughout the country. EPA, state, tribal and local agencies use that data to ensure that PM in the air is at levels that protect public health and the environment. Nationally, average PM concentrations have decreased over the years. For information on PM standards, sources, health effects, and programs to reduce PM, please see www.epa.gov/air/particlepollution.How to Interpret the Graphs
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How to Interpret the Graphs
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Local Trends in Particulate Matter Levels
Air quality trends can vary from one area to another. Local trends are available at individual monitoring locations with an adequate record of historical data.
PM2.5
![Map of the United States](images/us-states.gif)
PM10
![Map of the United States](images/us-states.gif)