The main idea here is that there will be a major difference in air quality, for the better, if LEV standards are implemented and followed. It should also be clear that even LEV technology has a ways to go to deal with the carbon monoxide problem. It should be noted that other technologies exist that may play a part in the clean-air effort. While the roles they will play at this point are unknown, they each show promise. Diesel engines are everywhere.
Farmers use diesels in the field, there are diesel trucks, diesel buses and diesel trains.
Marine diesel engines are among the worst polluters. The smoke they emit is full of particles thought to be hazardous. Researchers have developed an oxygen enrichment device that reduces particulate emissions almost 60 percent while increasing engine power output. This could be the link that can help diesel engines meet federal standards for particulate and smoke emissions set by the Clean Air Act. Diesel engines strength, reliability, and efficiency also make them a candidate to run the next generation of clean, efficient cars.