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Question raised in Lok Sabha on Pollution in Delhi, 29/11/2016

Question raised in Lok Sabha on Pollution in Delhi, 29/11/2016. The methodology for calculation of pollution index in various parts of world is not same. Cities can be ranked on the basis of different criteria pollutants with different results. An ambient air pollution database released by the World Health Organisation in May 2016 indicates that 10 Indian cities including Delhi fall among top 20 most polluted cities in the world in respect of PM2.5 (particulate matter) which is based on extrapolation of data relating to PM10 to arrive at PM2.5 data based on conversion factors in respect of cities where PM2.5 data is not measured. Therefore, care has to be exercised before drawing any inference.

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