Contains information on fuel types, emissions regulations, and more.

This page presents emission-related information about heavy-duty highway engines, such as those used in trucks and buses. Much of this content is focused on diesel engines, but requirements also apply for gasoline-fueled and other spark-ignition engines.

From the EPA, this page contains information and regulations on Diesel Fuel.

Has emission-related information about Nonraod diesel engines. Nonroad diesel engines are used in machines that perform a wide range of important jobs. These include excavators and other construction equipment, farm tractors and other agricultural equipment, heavy forklifts, airport ground service equipment, and utility equipment such as generators, pumps, and compressors.

Self-described as the world's largest diesel magazine, the accompanying online Website offers articles, news, videos, blogs, and community posts about everything diesel, from Diesel Power magazine’s Tech section showcasing power modifications and hands-on installation of diesel performance parts designed to improve vehicle performance to the news section which takes an in-depth look at trends and technological developments in the diesel world.

Online Website for the magazine, this site offers industry news, product information and reviews, articles about every aspect of a diesel vehicle, and the "Build Series" which reports on upgrades or repairs to diesel vehicles and/or parts.

This Website is maintained by the National Biodiesel Board (NBB). Find biodiesel overviews, fact sheets, and technical reports and check out information on using biodiesel from purchasing and current markets to handling and use. Biodiesel production statistics, policy information on a federal and state level, and industry news also available from this site.