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I'm talking about smoke, I don't even know what an "infectious particle" is.

Me neither, and that's why I asked, but it apparently offended the HN commentariat.

Your quote didn't indicate that you were specifically asking about the infectious particles.

So you got responses about smoke and dust which are a very very common air quality problem.

No I specifically said (quoted) "and infectious particles" and compared it to an 18th century city, which predates indoor plumbing.

I guess that's too subtle for HN. In the future I will be sure to emphasise when my ANDs are boolean.