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In this 2018 file photo, people wear masks while walking through the Financial District in the smoke-filled air in San Francisco. 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/Eric Risberg, File)

In this 2018 file photo, people wear masks while walking through the Financial District in the smoke-filled air in San Francisco. 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/Eric Risberg, File)

June 26, 2019

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Smoke from western wildfires boosting health risk for millions
June 26, 2019 4 a.m.

Smoke from western wildfires boosting health risk for millions

BILLINGS — Climate change in the Western U.S. means more intense and frequent wildfires churning out waves of smoke that scientists say will sweep across the continent to affect tens of millions of people and cause a spike in premature deaths.