The U.S. Environmental Protection Agency (EPA) has awarded $30 million in grants for clean diesel projects across the country.

The Diesel Emission Reduction Program, also known as DERA, is designed to replace, retrofit or repower older diesel-powered engines like marine vessels, locomotives, trucks and buses.

Recipients of the grants were selected based on a proposal’s potential for maximizing health and environmental benefits by targeting areas that have significant air quality issues, EPA said.

DERA was enacted in 2005 and since it was first funded in fiscal year 2008, EPA has awarded over 500 grants nationwide.

The complete list of grant recipients is available here.

More on the grants and the National Clean Diesel Campaign: