'Carmaheaven': Closure of 405 in 2011 improved Los Angeles area air quality up to 83 percent

Take the time to enjoy a deep breath next weekend when the 405 freeway in the Los Angeles, California area closes for Carmageddon II. If it's anything like last year, the air quality is about to get amazing. Researchers report that they measured air pollutants during last year's Carmageddon (July 15) and found that when 10 miles of the 405 closed, air quality near the shuttered portion improved within minutes, reaching levels 83 percent better than on comparable weekends.

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