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! Time period !! Development summary
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| 1980s || The issue of air and water pollution in Delhi enters the [[w:Supreme Courtof India|Supreme Court]]'s agenda in the late decade, and periodic statements and orders are issued from the bench.<ref name="Environmentalism">{{cite book |last1=Bauer |first1=Joanne R |title=Forging Environmentalism: Justice, Livelihood, and Contested Environments: Justice, Livelihood, and Contested Environments |url=https://books.google.com.ar/books?id=4G5sBgAAQBAJ&pg=PA198&lpg=PA198&dq=%22pollution%22+%22delhi%22+%22in+july%22+%221980..2019%22&source=bl&ots=wj80RtlT_-&sig=ACfU3U0LMYBphSCEP7yFPIs4nmiCA_O2fQ&hl=en&sa=X&ved=2ahUKEwj3ku_hvY_iAhVHF7kGHeIyCiUQ6AEwAHoECAUQAQ#v=onepage&q=%22pollution%22%20%22delhi%22%20%22in%20july%22%20%221980..2019%22&f=false}}</ref>
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| 1990s || Delhi reaches among the world's worst urban air quality. Air pollution's heavy impacts on human health, including infant mortality and asthma, leads to sustained efforts for improvement by Indian civil society.<ref name="Delhi air quality">{{cite web |title=Delhi air quality |url=http://wwf.panda.org/?204661/Delhi-air-quality |website=panda.org |accessdate=9 May 2019}}</ref> Several small and medium-size industries are relocated from Delhi as a measure to control pollution.<ref>{{cite web |title=Delhi lacks long-term plan to check industrial pollution |url=https://www.hindustantimes.com/delhi-news/delhi-lacks-plan-to-check-industrial-pollution/story-XvnVL4h3w1ki2mdhFb9fuK.html |website=hindustantimes.com |accessdate=10 May 2019}}</ref>
| 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 [[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 || || || The Indian [[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 || || || 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 Indian [[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 || || The Indian [[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 || || {{w|Air pollution}} || The Indian [[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 || || || 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"/>
| 2007 || || {{w|Air pollution}} || Study finds that the conversion of buses from diesel to CNG in Delhi helped reduce {{w|particulates}}, {{w|carbon monoxide}}, and {{w|sulfur oxide}}, while lowering the sulphur content of fuels cut both {{w|sulfur dioxide}} and – due to SO2 converting to sulphates, fine particles (PM10). Another study only identified lower CO as a result of the change to {{w|compressed natural gas}} in Delhi.<ref name="Delhi air quality"/>
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| 2009 || || Policy || Delhi allows the use of only virgin plastic.<ref name="Urban Environmental Governance"/>
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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>
