Smog

A committee of science advisors has urged the U.S. Environmental Protection Agency to tighten federal standards for ozone, the main component of smog. Above, a hazy view of downtown Los Angeles.

( Francine Orr / Los Angeles Times )

A committee of science advisors has urged the U.S. Environmental Protection Agency to tighten federal standards for ozone, the main component of smog. Above, a hazy view of downtown Los Angeles.

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