MUMBAI: The city recorded 27 "poor air" days, when daily average PM2.5 levels were between 90 and 120 ug/m3, in January and February, compared with just six such days in the corresponding period last year, reports Chittaranjan Tembhekar.In fact, there were zero "good air" days-average PM2.5 levels under 30 ug/m3-in February, shows data from the National Clean Air Programme.Track the pollution level in...