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National Air Quality: Status and Trends of Key Air Pollutants

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EPA tracks trends in six key pollutants called criteria air pollutants.

Overview of Air Quality Through 2018

Explore air quality trends interactively - Our Nation's Air: Status and Trends Through 2017
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National Air Quality: Status and Trends of Key Air Pollutants

Air Quality Trends

Reports and Summaries

See other links for air quality data and tools

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