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| 1955 || || {{w|Water pollution}} || Sewage and industrial wastes from the {{w|Najafgarh drain}} causes a famous {{w|jaundice}} episode in Delhi. The Najafgarh drain comes 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 || || Policy || 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 || || Policy || 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 || || Policy ({{w|Air air pollution}} ) || The {{w|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"/>
| 1994 || || {{w|Water pollution}} || The Supreme Court takes ''[[w:Sua sponte|suo motu]]'' notice of a newspaper report about the pollution of the {{w|Yamuna}}.<ref name="Environmentalism"/>
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| 1995 || || Policy || The {{w|Supreme Court of India}} asks the Delhi Pollution Control Committee to categorize all industrial units in the city according to pollution hazard they pose.<ref name="Forging Environmentalism: Justice, Livelihood, and Contested Environments">{{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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| 1995 || || Policy ({{w|air pollution}}) || Delhi government introduces catalytic converter in passenger cars as vehicle control measure policy to curb air pollution in the city.<ref name="Pollution in Delhi : A Chronic Problem"/>
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| 1996 || February || {{w|Water pollution}} || The {{w|Supreme Court of India}} 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 || Policy || The {{w|Supreme Court of India}} 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 || || Policy ({{w|Air air pollution}} ) || The {{w|Supreme Court of India}} 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 || || Policy ({{w|air pollution}}) || 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 || || Policy ({{w|air pollution}}) || 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 || || Policy || After Supreme Court order on hazardous waste, stringent actions are prompted by various State Pollution Control Board in Delhi.<ref name="Urban Environmental Governance"/>
| 2017 || November || {{w|Air pollution}} || A public health emergency is declared by the Indian Medical Association in Delhi as air quality index breached 999, likened to smoking 50 cigarettes a day. Air pollution raises to over 710 micrograms per cubic meter, more than 11 times the World Health Organisation’s safe limit.<ref>{{cite web |title=Toxic Air Is Now A Year-Round Problem For Delhi |url=https://www.bloombergquint.com/politics/toxic-air-is-now-a-year-round-problem-for-delhi-2 |website=bloombergquint.com |accessdate=9 May 2019}}</ref><ref>{{cite web |last1= |first1= |title=Delhi doctors declare pollution emergency as smog chokes city |url=https://www.theguardian.com/world/2017/nov/07/delhi-india-declares-pollution-emergency-as-smog-chokes-city |website=theguardian.com |accessdate=8 May 2019}}</ref><ref>{{cite web |title=Delhi residents panic as 'deadly smog' returns |url=https://www.bbc.com/news/world-asia-india-41896676 |website=bbc.com |accessdate=8 May 2019}}</ref><ref>{{cite web |title=Delhi's air pollution is triggering a health crisis |url=https://www.bbc.com/news/world-asia-india-41925067 |website=bbc.com |accessdate=8 May 2019}}</ref>
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| 2017 || November 25 || Policy ({{w|Air air pollution}} ) || The {{w|Supreme Court of India}} bans the sale of {{w|firecracker}}s in Delhi to alleviate pollution.<ref>{{cite news|title=Supreme Court bans sale of firecrackers in Delhi, NCR |url=http://timesofindia.indiatimes.com/home/environment/pollution/SC-bans-sale-of-fire-crackers-in-Delhi-NCR/articleshow/55617850.cms? |accessdate=8 May 2019|work={{w|Times of India}}}}</ref>
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| 2017 || December || {{w|Air pollution}} || During [[w:Sri_Lankan_cricket_team_in_India_in_2017–18#3rd_Test|a test match]] between [[w:Sri Lanka cricket team|Sri Lankan]] and [[w:Indian cricket team|Indian]] cricket teams in New Delhi, Sri Lanka players begin to feel breathing problems and several players vomit both in the rest rooms and in the field and have to use face masks until the end of the match.<ref name="Safi">{{Cite news|url=https://www.theguardian.com/world/2017/dec/03/pollution-stops-play-at-delhi-test-match-as-bowlers-struggle-to-breathe|title=Pollution stops play at Delhi Test match as bowlers struggle to breathe|last=Safi|first=Michael|date=2017-12-03|work=The Guardian|access-date=8 May 2019|language=en-GB|issn=0261-3077}}</ref>
