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Wildfire smoke has resulted in as much as half of the soot pollution in parts of the western U.S., according to a study that was published on Tuesday.
Researchers determined that more than half of the concentrations of the pollutant in some areas came from wildfires in recent years and that their smoke made up 25 percent of soot pollution across the entire U.S.
Using satellite-based fire and smoke data, the researchers also determined that pollution from fires had increased substantially over the course of a decade.
The amount of area burned by wildfires has been rising, and other studies have linked the increase, at least in part, to climate change.