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{| class="sortable wikitable"
! Year !! Month and date !! Pollution type !! Type of event !! Details
|-
| 1947 || || {{w|Air pollution}} || || India becomes an independent state. At the time, fog in Delhi is rather rare.<ref name="Balachandran">{{cite web |last1=Balachandran |first1=Manu |last2=Thomas |first2=Maria |title=Delhi’s air is so toxic that schools are closing, expats are fleeing, and the visiting UK PM could lose hours from her life |url=https://qz.com/india/828754/india-pollution-schools-shut-down-expats-flee-and-the-visiting-uk-pm-theresa-may-risks-losing-hours-from-her-life-as-delhi-chokes/ |website=qz.com |accessdate=12 June 2019}}</ref>
|-
| 1950–1951 || December–February || {{w|Air pollution}} || || Only one foggy day is reported in the winter months in the city.<ref name="Balachandran"/>
|-
| 1955 || || {{w|Water pollution}} || Crisis || Sewage and industrial wastes from the {{w|Najafgarh drain}} cause 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>
|-
| 1995 || || {{w|Air pollution}} || Policy || 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"/>
|-
| 1996 || || {{w|Air pollution}} || || 46 foggy days are reported in the winter months in {{w|Delhi}}.<ref name="Balachandran"/>
|-
| 1996 || February || {{w|Water pollution}} || Policy || 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"/>
|-
| 2012 || || {{w|Water pollution}}, {{w|soil contamination}} || Policy || Delhi completely bans all plastic.<ref name="Urban Environmental Governance"/>
|-
| 2013 || || {{w|Air pollution}} || || 74 foggy days are reported in the winter months in {{w|Delhi}}.<ref name="Balachandran"/>
|-
| 2013 || January || {{w|Air pollution}}, {{w|water pollution}}, {{w|soil contamination}} || Policy || The High Court of Delhi directs the civic authorities of Delhi to shift the biomedical waste incinerator from the residential area in the city to outside.<ref name="Urban Environmental Governance"/>
