The Environmental Protection Agency announced April 23 that it is making up to $20 million in grant funding available for clean diesel projects that reduce emissions from existing diesel engines. Projects may include, but are not limited to, emission control and idle reduction technologies; cleaner fuels; engine upgrades or replacements; and vehicle or equipment replacements. Only technologies that have been certified by the agency or the California Air Resources Board are eligible, and requests for proposals are due by June 4.