In this 2018 photo, a girl works on a drawing next to an unused viewing scope as a smoky haze obscures the Space Needle and downtown Seattle behind. Tens of millions of people in the Western US face a growing health risk due to wildfires as more intense and frequent blazes churn out greater volumes of lung-damaging smoke, according to research scientists at NASA and several major universities. (AP Photo/Elaine Thompson, File)

In this 2018 photo, a girl works on a drawing next to an unused viewing scope as a smoky haze obscures the Space Needle and downtown Seattle behind. Tens of millions of people in the Western US face a growing health risk due to wildfires as more intense and frequent blazes churn out greater volumes of lung-damaging smoke, according to research scientists at NASA and several major universities. (AP Photo/Elaine Thompson, File)

Health impact from smoke rises with more intense wildfires

The West Coast and the Rocky Mountains are widely expected to suffer the most from blazes.

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