Jan. 8, 2010
“We appreciate how much cleaner cars have become, but that speaks more to how polluting cars used to be,” says Dan Becker, climate campaigner for the Center for Auto Safety. “Cars are still a major source of smog, even after cleaning up a lot, because they were very filthy. The air is still unhealthy for millions of people, and the technology is available inexpensively for cars to clean up further.”