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Wildfires Reverse Progress on Cleaner Air, Study: For more than a decade, the United States dramatically reduced its national smog levels, but since 2015, smoke from increasingly larger wildfires is reversing that clean-up trend and making the air dirtier and deadlier, a new study finds.Scientists say climate change… #Wildfires #ClimateChange #AirQuality #CleanAir #EnvironmentalImpact