
Explained | What has Delhi done over the decades to combat air pollution?
The HinduThe story so far: Last week, Delhi was once again covered in a cascading haze of smog— witnessing very poor air quality, sticking to the trend that has existed during winter months for some years now. In November 2016, the Supreme Court told Delhi and NCR authorities to form a plan to deal with air pollution and subsequently the MoEFCC in early 2017 came out with the Graded Response Action Plan, which involved coordination between multiple agencies in Delhi to activate reactive pollution control measures corresponding to increasing Air Quality Index levels. Multiple studies over the years, including the Delhi Pollution Control Committee’s 2019 report by IIT Delhi and Madras experts, found that the rapid growth in Delhi’s population, industrialisation and urbanisation, and increase in the motorised private vehicle fleet have resulted in the increased concentration of pollutants such as particulate matter, nitrogen oxides, sulphur dioxide, carbon monoxide, and ozone. UrbanEmissions.Info combined officially available information and its modelling studies to infer that the share of vehicular exhaust to Delhi’s ambient PM2.5 pollution is up to 30%, soil and road dust is up to 20%, biomass burning 20%, industries up to 15%, diesel generators up to 10%, power plants up to 5% and notably, the share of pollution from outside Delhi’s urban airshed is up to 30%. A study by IIT Delhi’s Rahul Goel noted that although vehicular emissions contribute 25% to Delhi’s PM2.5 levels, passenger vehicles contribute just 8%, of which cars constitute 5%.
History of this topic

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