Mobile Source Emissions - Past, Present, & Future

This site presents information on air pollution from vehicles, engines, and other machines that move.

Here you can learn about the pollutants that come from these everyday sources, such as cars, boats, and lawnmowers— collectively known as mobile sources. Find out what solutions EPA and others developed to help control this pollution and see the results of these ongoing actions.

Learn what you can do to reduce emissions.

This page is maintained by EPA's Office of Transportation and Air Quality (OTAQ).
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