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Whoa, what's going on in Utah? https://www.purpleair.com/map#6.74/39.975/-111.145

Geography and local weather patterns, similar to Mexico City in that regard where the city sits surrounded mostly by mountains and frequent broadly local temperature conditions trap air in the valley.

There's also a 113,000 acre fire burning currently.

Lots of fires. For the past couple of months something has been burning here and the air has been mad much more often than not.

AirNow also has a national map for US air quality: https://gispub.epa.gov/airnow/

I'm quite concerned about air quality in the UK but according to that map everywhere in the UK is "good", even London.

They only seem to take aerosol into account. And if you're looking at the current data, that's a saturday morning, which most properly means the traffic is pretty low.