Glowing red skies and bitter ash-laden air are increasingly common across much of the US as the warming climate fuels vast wildfires. For years now, researchers have understood that wildfire smoke, and the noxious gases and soot particles it carries, isn’t merely an unpleasant experience that forces people to shut windows and herd children indoors. It’s a significant health hazard that not only triggers asthma and breathing problems, but can harm immune systems for years.
But new research is revealing that the threat is more complex than previously known—and also more dangerous, if that’s possible. The churning convection in those enormous plumes
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