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gwern comments on Teaching English in Shanghai - Less Wrong
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Possibly from the air intakes located on the roof of the buildings. Pollution is much worse on street level than 20 stories up. At least in Jakarta, where I lived for 6 months.
IIRC, the US Embassy's controversial pollution readings were being taken from their rooftop, and in photos of Beijing you can see the smog in the sky - so the rooftop pollution may still be pretty bad.