Home / ScienceNPRScienceNPR·Jul 18, 2026·1 min readAir quality improving in northeast, while wildfire smoke hangs over midwestWildfire smoke and unhealthy air persist and shift direction, as Trump demands explanation from Canada. (Image credit: Finn Gomez/Getty Images)View original source — NPR ↗ShareCopy linkShare on XShare on FacebookRelated storiesABC NewsScienceJul 18, 2026 · 1 minBid to fix stubborn Murray River sand slug 'hamstrung' by competing demandsABC NewsAl JazeeraScienceJul 18, 2026 · 1 minDrone video shows scale of major wildfire in northern SpainAl JazeeraThe GuardianScienceJul 18, 2026 · 1 minAustralia’s fuel tax break slowing BHP’s decarbonisation, mining giant’s investors warnedThe GuardianThe GuardianScienceJul 18, 2026 · 1 minFlash flood warnings strike north-east US amid wildfire smoke from CanadaThe Guardian
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