Question raised in Lok Sabha on particulate matter in the air, 28/07/2015. The air quality problem is prevailing in many cities across the World. Some world’s cities are non-compliant in respect of particulate matter while other cities are non-compliant for benzene, nitrogen oxides, ozone etc. The study published by Energy Policy Institute, Chicago, in February 2015 is based on estimates /extrapolation and not an actual data. There is no established methodology to directly correlate quality of air with life expectancy.