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America's Ring of Fire

The smoke’s gone, but hearts and lungs still may be in danger months after wildfires

Pedestrians wear masks while walking through San Francisco’s Financial District on Nov. 9. For two weeks after the Camp Fire ignited, the air in Northern California, stretching as far as 200 miles from the flames, was so full of smoke that it was deemed unhealthy to breathe.

Credit: Eric Risberg/Associated Press

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