Choking on Wildfire Smoke

Southern Californians live with the health-effects of smog produced mostly by automobile and truck traffic. Wild fires produce additional pollution, particles from the smoke and ashes of burning vegetation and materials used in building construction. We hear about the biological consequences, where they're the worst and how soon we can all breath in relative safety from Sam Atwood of the AQMD and USC's Constantinos Sioutas, co-director of Southern California Particle Center.