The downtown Los Angeles skyline is seen from a freeway Wednesday, April 28, 2010. The U.S. Environmental Protection Agency on Thursday updated its standard on how much ozone -- smog -- will be allowed in the air.
The downtown Los Angeles skyline is seen from a freeway Wednesday, April 28, 2010. The U.S. Environmental Protection Agency on Thursday updated its standard on how much ozone -- smog -- will be allowed in the air. REED SAXON AP
The downtown Los Angeles skyline is seen from a freeway Wednesday, April 28, 2010. The U.S. Environmental Protection Agency on Thursday updated its standard on how much ozone -- smog -- will be allowed in the air. REED SAXON AP

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