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Despite Beijing's best efforts, air pollution became the center issue last week on the eve of the Olympics , when a grey haze cut visibility down to a mile. While Chinese officials struggle with cleaning up the air for athletes, half a world away,
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Just how clean is the air we breathe in Houston? Today our air was rated code green or "good," as measured by the Air Quality Index , a rating system by the U.S. Environmental Protection Agency that measures five major pollutants and assigns
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