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Since then, AQI has been the topic of discussion ... During this trip you went to Shanghai which just so happens to be where the factories that build most cheap circular air purifiers are made.

Other cities on the list include Shanghai, China (173), Dhaka, Bangladesh (171), Karachi (170), and Bishkek, Kyrgyzstan (167). Detailed AQI data from Lahore reveals even more alarming figures at ...