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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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| 1990 – 2001 || || Policy || A Master Plan of Delhi allows for "light" industry to be set up in residential areas. This creates a leeway for many industries which are not in the hazardous category (H) to start in the areas vacated by the "H" category industries without the necessity for any permission from the Delhi Pollution Control Committee.<ref name="Urban Environmental Governance">{{cite book |last1=Raju |first1=K.V. |last2=Ravindra |first2=A. |last3=Manasi |first3=S. |last4=Smitha |first4=K.C. |last5=Srinivas |first5=Ravindra |title=Urban Environmental Governance in India: Browsing Bengaluru |url=https://books.google.com.ar/books?id=9LRTDwAAQBAJ&pg=PA51&lpg=PA51&dq=%22pollution%22+%22delhi%22+%22in+july%22+%221980..2019%22&source=bl&ots=Dx5PcfWeTQ&sig=ACfU3U1LpUtnPAgk7TjwpaKWHVliKxfGMg&hl=en&sa=X&ved=2ahUKEwj3ku_hvY_iAhVHF7kGHeIyCiUQ6AEwCnoECAkQAQ#v=onepage&q=%22pollution%22%20%22delhi%22%20%22in%20july%22%20%221980..2019%22&f=false}}</ref>
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| 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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| 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 Supreme Court 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>
