Gone are the days of dirty, diesel school buses emitting black clouds of soot as they rumble down the nation's roads and highways. This is thanks to industry efforts to implement cleaner engine solutions and alternative fuels through advanced research and funded via several federal, state and local initiatives. One of these is the U.S. Environmental Protection Agency's Clean School Bus USA program, part of the National Clean Diesel Funding Assistance Program, which has funded dozens of projects responsible for thousands of new school bus purchases, diesel engine retrofits and school district anti-idling programs. The EPA also directs regional and state funding programs through its collaboratives.
Other sources include the Congestion Mitigation and Air Quality Program, the Transportation Equity Act for the 21st Century, the U.S. Department of Energy's Clean Cities program, and numerous state and local air quality districts, just to name a few.