“[Spending] a day in Beijing does about the same harm to a person’s health as smoking 40 cigarettes.”


I recall reading that under certain conditions the air in Salt Lake City is “smoggier” than in Beijing (https://gregjonesorg.wordpress.com/2014/04/15/on-some-days-and-by-some-measures-salt-lake-city-is-smoggier-than-beijing/).  I am not sure how often that is the case, or to what extent the same is true of other cities, but it is alarming, nonetheless.

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