In this Aug. 11, 2021 file photo smoke from a wildfire obscures a stand of trees on the Northern Cheyenne Indian Reservation, near Ashland, Mont. In southeastern Montana, communities in and around the Northern Cheyenne Indian Reservation were ordered to evacuate as the Richard Spring Fire grew amid erratic winds. (AP Photo/Matthew Brown,File)
August 26, 2021
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August 26, 2021 10:20 a.m.
Gaps in US wildfire smoke warning network leave many exposed
Microscopic particles in wildfire smoke can cause serious problems for people with chronic health conditions