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Hmm, what country does this happen in? I've never seen it use Low/High, only from Good to Hazardous.

Same for me in US English. For example, right now it’s “18 - Good”. It was “469 - Hazardous” just three weeks ago though.

Happen to have any large fires nearby?

Yep, the Ontario Canada wildfires destroyed air quality for the NE part of the US.

In the UK for example.

Right now mine says “Air pollution: low. Air quality index is 3”. Apparently using the DAQI for classification

Huh, looks like you're right. Maybe they fixed it at some point?