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Smog in national parks

Smog and air pollution can travel thousands of miles. The result is often air pollution where it is least expected. This is especially shocking in Sequoia National Park, where the air quality can sometimes be as bad as in Los Angeles. AP video. (May 29)

Smog and air pollution can travel thousands of

Smog and air pollution can travel thousands of miles. The result is often air pollution where it is least expected. This is especially shocking in Sequoia National Park, where the air quality can sometimes be as bad as in Los Angeles. AP video. (May 29)

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