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Wildfire smoke contributes to thousands of deaths each year in the U.S.

Wildfire smoke covered huge swaths of the U.S. in 2023, including places like New York City, where it has historically been uncommon. New research shows the health costs of breathing in wildfire smoke can be high.

Two new studies show the unseen toll smoke is taking on people across the country. Climate change is likely to make the problem even bigger.

(Image credit: David Dee Delgado)