California cars 99% cleaner than in 1960s, but smog levels still high, study says - Los Angeles Times http://news.google.com/news/url?sa=t&fd=R&usg=AFQjCNGBMu_y0THkSSo8gfbxT7gQcZWl6g&url=http://latimesblogs.latimes.com/technology/2010/11/california-cars-99-cleaner-than-in-1960s-but-smog-levels-still-high-study-says.html