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Mexico City Issues First Ozone Alert in 14 Years

Mexico City is banning some cars from city streets again Wednesday because of the first ozone alert in 14 years. The Mexican capital, once known for its high smog levels, has managed since 2002 to keep its ozone levels within recommended boundaries, and since 2005 it has managed to keep harmful air particles under control as well. But Mexico City authorities say a recent high pressure system combined with intense sunlight has contributed to elevated pollution levels. Mexico initially...

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