Revealed: how a little-known pollution rule keeps the air dirty for millions of Americans
Haus@kbin.social to 
theguardian.com
Major investigation shows local governments are increasingly exploiting a loophole in the Clean Air Act, leaving more than 21 million Americans with air that’s dirtier than they realize
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Kinda hard to blame [US City] because air pollution was bad for a few days due to Canadian wildfires.
I'm not sure I trust those Canadians with fire, they might come down here and burn down a building or two, again.
Urban greening can help filter the air pollution no matter the origin.