For decades, the United States made steady progress in reducing surface ozone pollution, the main ingredient in smog. But that progress—made as vehicles, industries, and power sources became cleaner—is increasingly being overshadowed by a different and growing source of ozone pollution: wildfires.

For decades, the United States made steady progress in reducing surface ozone pollution, the main ingredient in smog. But that progress—made as vehicles, industries, and power sources became cleaner—is increasingly being overshadowed by a different and growing source of ozone pollution: wildfires.

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