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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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| 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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| 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"/>
| 1993 – 2000 || || {{w|Light pollution}} || Study author Pavan Kumar says {{w|New Delhi}}, along with {{w|Telangana}}, {{w|Maharashtra}}, {{w|Karnataka}} and {{w|Uttar Pradesh}} experienced increase in “very high light pollution intensity” in the period.<ref>{{cite web |title=Not just air, light pollution too is on the rise in India |url=https://scroll.in/article/909978/not-just-air-light-pollution-too-is-on-the-rise-in-india |website=scroll.in |accessdate=8 May 2019}}</ref>
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| 1997 1995 || || {{w|Air pollution}} || The annual suspended particulate matter average concentration Indian Supreme Court asks the Delhi Pollution Control Committee to categorize all industrial units in Delhi is 339.3 microgrammes per cubic meterthe city according to pollution hazard they pose.<ref name="Air PollutionfForging Environmentalism: Justice, Livelihood, and Contested Environments">{{cite book |last1=Agarwal Bauer |first1=S. KJoanne R. |title=Air Pollution Forging Environmentalism: Justice, Livelihood, and Contested Environments |url=https://books.google.com.ar/books?id=dJlxyyLX0MoCc5amHzE241EC&pg=PA21PA198&lpg=PA21PA198&dq=delhi+pollution+%22in+1990..1999%22&source=bl&ots=DEtF0ZVr2FpTitq09Rse&sig=ACfU3U1KGOrShtCgl4aKK6gcnO6XdSnwuQACfU3U07H9wh6Fql_c2u_yDBo0XYXbM9Eg&hl=en&sa=X&ved=2ahUKEwjHoLaP94ziAhVbJrkGHc6XD0oQ6AEwAnoECAgQAQ2ahUKEwjHoLaP94ziAhVbJrkGHc6XD0oQ6AEwAXoECAkQAQ#v=onepage&q=delhi%20pollution%20%22in%201990..1999%22&f=false}}</ref>
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| 1995 || || || The Indian Supreme Court asks the Delhi Pollution Control Committee government introduces catalytic converter in passenger cars as vehicle control measure policy to categorize all industrial units curb air pollution in the city according to pollution hazard they pose.<ref name="Forging EnvironmentalismPollution in Delhi : Justice, Livelihood, and Contested EnvironmentsA Chronic Problem">{{cite book |last1=Bauer |first1=Joanne R. |title=Forging Environmentalism: Justice, Livelihood, and Contested Environments |url=https://books.google.com.ar/books?id=c5amHzE241EC&pg=PA198&lpg=PA198&dq=delhi+pollution+%22in+1990..1999%22&source=bl&ots=pTitq09Rse&sig=ACfU3U07H9wh6Fql_c2u_yDBo0XYXbM9Eg&hl=en&sa=X&ved=2ahUKEwjHoLaP94ziAhVbJrkGHc6XD0oQ6AEwAXoECAkQAQ#v=onepage&q=delhi%20pollution%20%22in%201990..1999%22&f=false}}</ref>
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| 1996 || February || {{w|Water pollution}} || The Indian Supreme Court orders the Delhi state government to construct common effluent treatment plants, which the industries are required to pay for, to reduce water pollution.<ref name="Forging Environmentalism: Justice, Livelihood, and Contested Environments"/>
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| 1996 || April || || The Indian Supreme Court orders the relocation of factories away from residential areas.<ref name="Forging Environmentalism: Justice, Livelihood, and Contested Environments"/>
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| 1997 || || {{w|Air pollution}} || The annual suspended particulate matter average concentration in Delhi is 339.3 microgrammes per cubic meter.<ref name="Air Pollutionf">{{cite book |last1=Agarwal |first1=S. K. |title=Air Pollution |url=https://books.google.com.ar/books?id=dJlxyyLX0MoC&pg=PA21&lpg=PA21&dq=delhi+pollution+%22in+1990..1999%22&source=bl&ots=DEtF0ZVr2F&sig=ACfU3U1KGOrShtCgl4aKK6gcnO6XdSnwuQ&hl=en&sa=X&ved=2ahUKEwjHoLaP94ziAhVbJrkGHc6XD0oQ6AEwAnoECAgQAQ#v=onepage&q=delhi%20pollution%20%22in%201990..1999%22&f=false}}</ref>
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| 1998 || || {{w|Air pollution}} || The Indian Supreme Court orders a major transformation of Delhi's transportation system, in response to a public interest petition on air pollution.<ref name="Forging Environmentalism: Justice, Livelihood, and Contested Environments"/>
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| 1998 || || || Delhi government introduces unleaded petrol as vehicle control measure policy to curb air pollution in the city.<ref name="Pollution in Delhi : A Chronic Problem"/>
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| 2000 || || || Delhi government introduces reduction of benzene content in fuels and reduction of sulfur content in diesel as vehicle control measure policy to curb air pollution in the city.<ref name="Pollution in Delhi : A Chronic Problem"/>
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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>
