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"Breathing Easier: How Houston Is Working To Clean Up Its Air"

"The Houston area produces about a quarter of the nation's gasoline, and about a third of the plastics that are in our cars, cupboards and just about everywhere else. So it is no surprise that this heavily industrial area has a problem with air pollution. But in the past decade, Houston's air has improved dramatically."

Source: NPR, 05/30/2013

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