“If you see a sunset that’s really pink or red, it is indicative that there is a lot of air pollution, and so you should take precautions,” said Reid, whose research focuses on health impacts of wildfire smoke. “Stay indoors as much as possible.”

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Hayden recently helped create the Mortality Estimation Tool, a map that provides a real-time estimate of the number of deaths from wildfire smoke in every county across the U.S.

Article also features a cool and informative animation showing wildfire smoke movement over time.