L.A.'s 'Carmageddon' Produced Dramatic, Instantaneous Air Quality Improvements

Paulson and colleague Yifang Zhu measured pollutants in the air during Carmageddon last year and have recently released their pretty astounding findings. Air quality near the normally busy highway improved by 83 percent that day last July, relative to comparable weekends. Elsewhere in West Los Angeles, the improvement was equally dramatic. Air quality improved by 75 percent on that side of the city and in Santa Monica, and by 25 percent throughout the entire region, as a measure of the drop in ultrafine particulate matter associated with tailpipe emissions.

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