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A comment on Smell PGH lets you report weird smells in Pittsburgh. Parent comment

Re:Smell PGH lets you report weird smells in Pittsburgh by hollerith on Thursday June 22, 2017 @10:43PM (#14616818)
A lot of the PM2.5 (the kind of pollution mentioned in the link offered by parent) in the Bay Area is from houses and apartments burning wood.

Source: http://www.ozy.com/acumen/think-chinas-pollution-is-bad-try-...

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