Heat and Wildfire Smoke Are Even More Harmful When Combined, a Study Says

Background: Global warming is intensifying both threats.As humans warm the planet, both heat waves and wildfires are becoming more severe and longer-lasting in the American West. That also means they are more likely to overlap. Researchers have estimated that two-thirds of California’s land area experienced broiling heat and heavy wildfire smoke concurrently at some point during the state’s record fire year of…