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Sunday, July 20, 2008 |
Photo: U.S. Tightens Smog Rules; Critics Say Not EnoughThe U.S. government today announced new standards for the amount of ozone—a main ingredient of smog—allowed in the air. Los Angeles County is among 85 U.S. counties that currently exceed ozone limits set a decade ago, the government said. Photograph by Jodi Cobb/National Geographic
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