Clean Diesel Comes of Age
Thursday, June 18, 2009 - 18:35
in Physics & Chemistry
For decades, diesel trucks and buses have spewed large amounts of soot, smog-causing gases and carcinogens into the air. But new diesel engines are more than 90 percent cleaner than a few years ago, far exceeding the emission reductions required by the U.S. Environmental Protection Agency, according to a new study released Thursday. [More]