EPA’s latest Trends Report reveals the extent of areas that violate the NAAQS for fine particles for the first time.
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With the establishment of new air quality standards for fine particles, EPA launched a million nationwide monitoring network to identify areas that exceed the standards.

The U.S. General Accounting Office (GAO), a Congressional watchdog, commenced a review of problems encountered during the first year of the monitoring program.
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81.5 million people live in counties that exceed the ozone NAAQS, and at least 75 million people live in counties that violate the PM2.5 standards according to the annual air quality trends report released by EPA October 18, 2001. All told, 121.4 million Americans live in counties that violate the basic public health standards for any of six criteria air pollutant.
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With the establishment of a new NAAQS for fine particles, EPA had to specify a new federal reference method for measuring fine particles, new criteria for placement of monitors, new schedules for data collection, and new procedures for ensuring the quality of particulate matter data.
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There is an important new source of localized information that can serve as an indicator of environmental health trends in your region.

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About 200 real-time, or continuous, air quality monitors for fine particles (PM2.5) have recently been deployed in urban areas in the United States.
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