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HoustonChronicle.com - Costly cleanup in California CHINO, CALIF. - Regulators trying to clean Southern California's infamously unhealthy air have long targeted factories and old buses. Now they're setting their sights on a different breed of offender: dairy cows. Every year, the dairies east of Los Angeles and their roughly 300,000 cows produce a million tons of manure. The ammonia and other pollutants they generate mix with smokestack and tailpipe emissions blowing inland from the Los Angeles basin to create the dirtiest air in the nation.