I've been living there for 15years and it's the reason I've moved away. Frankly I love the city enough that I would sabotage my health for it. Not my kids health though. Asthma related problems in kids are widespreada and of course bad air quality is related to tons of other negative consequences.

I wonder though how do they compute the number (is it average across points measured in the city?). Because within city borders air quality varies wildly. There are some regions where it is actually pretty good.