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 1990-2007 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.

PM2.5 air quality between 2000 and 2007, based on the seasonally-weighted annual average. Chart shows a range of concentrations in 778 monitoring sites nationwide, with the average decreasing 11% from 2000 to 2007.

PM2.5 air quality between 2000 and 2007, based on the seasonally-weighted annual average. Chart shows a range of concentrations in 778 monitoring sites nationwide, with the average decreasing 11% from 2000 to 2007.

How to Interpret the Graphs
View the chart data in Microsoft Excel (Download Excel Viewer)
View the chart data in HTML (New window opens)

PM10 air quality between 1990 and 2007, based on the seasonally-weighted annual average. Chart shows a range of concentrations in 360 monitoring sites nationwide, with the average decreasing 28% from 1990 to 2007.

How to Interpret the Graphs
View the chart data in Microsoft Excel (Download Excel Viewer)
View the chart data in HTML (New window opens)

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

Particulate Matter

PM2.5

PM10

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