...UCLA researchers say that last year's Carmageddon closure of the 405 Freeway rid Los Angeles of both traffic and another notorious problem: pollution.
Air quality near the closed 10-mile portion of the freeway reached levels 83% better than typical weekends, according to research released Friday by a team at UCLA's Institute of the Environment and Sustainability. More striking, the researchers say, air quality also improved 75% in parts of West Los Angeles and Santa Monica, suggesting that whole swaths of residents stayed off the road in those areas. Overall, air quality across the region was 25% better than normal.
"Seeing such a dramatic reduction [in pollutants] in West L.A. was really quite surprising," said Suzanne Paulson, one of the professors leading the research. "It gives a very dramatic view of how clean the air could be." As soon as traffic returned the following week, the improvements vanished, Paulson said. But area residents have another chance to breathe some fresh air starting Saturday...
Full article at http://www.latimes.com/news/local/la-me-carmageddon-air-quality-20120928,0,3656316.story
So you know what to do: