Where the 2020 fires contributed the most to smoke exposure over the western US. (IMAGE)

Harvard John A. Paulson School of Engineering and Applied Sciences

Where the 2020 fires contributed the most to smoke exposure over the western US.

Caption

Where the 2020 fires contributed the most to smoke exposure over the western US. Red indicates the areas with the most smoke impact in September 2020, averaged over the western US and weighted for population. Blue indicates fires with the least smoke impact.

Credit

Harvard SEAS

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CC BY

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