The U.S. Environmental Protection Agency (EPA) is making the most recent data available on the state of the nation’s air quality. Air pollution impacts public health, the environment, and the Earth’s climate, and understanding these impacts are important priorities for the agency. EPA regulatory actions and voluntary efforts have led to cleaner cars, industries and consumer products, that in turn have contributed to improvements in the nation`s air.

Since 1990, nationwide air quality has imp…

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