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The Air is Becoming Cleaner

May 28, 2012
Plain English Version

The air in America’s cities is getting cleaner. A new study of air pollution shows that air quality is improving due to tougher environmental standards for soot and smog.

The Clean Air Act is given much of the credit. The act targets coal-fired power plants, diesel engines, and older SUVs, pick-up trucks, and vans.

Ozone levels and particle pollution are measured to test air quality. Both have gone down since 2000 even as economic activity is putting more vehicles on the road and factories are producing more goods.

Experts say air quality standards are still too low. More than 127 million Americans live in areas receiving an F grade for air quality. Los Angeles, Pittsburgh and Cincinnati remain among the most polluted cities in the nation.

The Christian Science Monitor

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