FILE - In this Aug. 10, 2017, file photo provided by the U.S. Forest Service, a pickup truck pulls a camper through the wildfire smoke in Seeley Lake in Missoula County, Mont. The small town was blanketed with hazardous smoke due to wildfires for seven weeks in 2017. A study showed residents' lung capacity declined in the first two years after the fires. The study team hasn't been able to return to Seeley Lake to check on the residents this year because of the coronavirus pandemic. (Kari Greer, U.S. Forest Service via AP, File)
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