Smog season in Los Angeles, where the air is dirtier than in any other city, is approaching. But as NPR's Mandalit DelBarco reports, L.A. has achieved huge reductions in air pollution over the past two decades, despite the city's reputation for lung-searing smog. Though new kinds of gas, cleaner industry and better cars are part of the solution, lots of little things have helped as well--like cleaner backyard barbecues.
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