Canada wildfire smoke is undoing decades of clean air progress in the U.S.
If your sky looks like a post-apocalyptic movie set lately, it’s not just a vibe—it’s microscopic ash invading your bloodstream.
Scientists noticed something pretty wild happening across the U.S.: the smoke drifting down from massive wildfires is getting so bad that it is completely wiping out decades of air quality gains made under the Clean Air Act.
Turns out, when trees—and people's houses—burn, they launch millions of tiny PM2.5 particles into the air that are way smaller than a human hair. Loose surgical masks don't do anything to block them because the smoke just slips right around the sides like air through a screen door.
So while everyone was busy cutting tailpipe emissions, massive forest fires just stepped in and took over the air pollution game.
Decades of strict environmental regulations getting undone by a gigantic cloud of floating trash feels like peak modern irony.
Source: The Conversation
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