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| 1955 || || || "The Najafgarth drain came to be known as "sorrow of Delhi""<ref>{{cite book |last1=Agarwal |first1=S. K. |title=Water Pollution |url=https://books.google.com.ar/books?id=VRl-24p3ju8C&pg=PA81&lpg=PA81&dq=%22pollution%22+%22delhi%22+%22in+1950..1969%22&source=bl&ots=GBwERB4Xbx&sig=ACfU3U3yFlFqPOOwPTxAV1K0Rb7e7cvnkg&hl=en&sa=X&ved=2ahUKEwjf2JD4oIziAhUOHbkGHWkIAfwQ6AEwCnoECAkQAQ#v=onepage&q=%22pollution%22%20%22delhi%22%20%22in%201950..1969%22&f=false}}</ref>
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| 1974 || || || The Central Pollution Control Board is set up under the Water Act.<ref name="Pollution in Delhi : A Chronic Problem"/>
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| 1982 || || || Delhi passes its first Industrial Policy.<ref name="Pollution in Delhi : A Chronic Problem">{{cite web |title=Pollution in Delhi : A Chronic Problem |url=https://www.jagranjosh.com/current-affairs/pollution-in-delhi-a-chronic-problem-1510211965-1 |website=jagranjosh.com |accessdate=9 May 2019}}</ref>
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| 1985 || || {{w|Air pollution}} || The Supreme Court of India states veredict to deal with the chronic problem of vehicular pollution in Delhi, one of the earliest stand taken by judiciary.<ref name="Pollution in Delhi : A Chronic Problem"/>
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| 1987 || || {{w|Air pollution}} || A survey estimates that 1172 tonnes of suspended particulate matter, hydrocarbons, sulphur dioxide, nitrogen oxides, carbon monoxide and other poisonous gases are spewed into the air in Delhi by industrial units, the various modes of transport and the power sector.<ref name="Air Pollutionf"/>
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| 2003 || || {{w|Air pollution}} || Delhi wins the {{w|United States Department of Energy}}'s first 'Clean Cities International Partner of the Year' award for its "bold efforts to curb air pollution and support alternative fuel initiatives".<ref name="cities.expressindia.com">{{cite web|url=http://cities.expressindia.com/fullstory.php?newsid=85665 |title=Express India |publisher=Cities.expressindia.com |accessdate=11 March 2011 |deadurl=yes |archiveurl=https://web.archive.org/web/20101231054504/http://cities.expressindia.com/fullstory.php?newsid=85665 |archivedate=31 December 2010 }}</ref>
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| 2011 || September || {{w|Air pollution}} || The {{w|World Health Organization}} releases data about urban air. This reveals that Delhi has crossed the maximum PM10 limit by almost 10-times at 198 μg/m3 (micrograms per cubic meter). Emission from vehicle and industrial activities are found to be linked with outdoor as well as indoor air pollution in Delhi.<ref name="Pollution in Delhi : A Chronic Problem">{{cite web |title=Pollution in Delhi : A Chronic Problem |url=https://www.jagranjosh.com/current-affairs/pollution-in-delhi-a-chronic-problem-1510211965-1 |website=jagranjosh.com |accessdate=9 May 2019}}</ref>
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| 2013 || April || {{w|Air pollution}} || Research paper by The Centre for Development Economics at Delhi School of Economics indicates that {{w|Delhi Metro}} helps reduce vehicular {{w|air pollution}}.<ref>{{cite web |title=Delhi Metro helps reduce vehicular air pollution, indicates research |url=https://www.indiatoday.in/india/north/story/delhi-metro-helps-reduce-vehicular-air-pollution-delhi-school-of-economics-160315-2013-04-28 |website=indiatoday.in |accessdate=9 May 2019}}</ref>
