An official website of the United States government.

This is not the current EPA website. To navigate to the current EPA website, please go to This website is historical material reflecting the EPA website as it existed on January 19, 2021. This website is no longer updated and links to external websites and some internal pages may not work. More information »

Voluntary Programs to Reduce Mobile Source Pollution

Find voluntary programs and initiatives to reduce emissions from mobile sources:

  • Clean Diesel
    This program offers funding for projects that protect human health and improve air quality by reducing harmful emissions from diesel engines.
  • Clean School Bus USA
    This national program is designed to help communities reduce emissions from older diesel school buses.
  • EPA's School Siting Guidelines
    These guidelines can help local school districts, local education agencies (LEAs), and community members evaluate environmental factors to make the best possible school siting decisions.
  • Ports Initiative
    The Ports Program is an EPA initiative with goals to reduce air pollution and greenhouse gases, to achieve environmental sustainability for ports, and improve air quality for near-port communities.
  • SmartWay Program
    This program helps businesses create more sustainable supply chains by moving freight in the cleanest most fuel-efficient ways possible.