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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>
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| 2009 2012 || || || Delhi completely bans all plastic.<ref name="Urban Environmental Governance"/>
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| 2013 || April || {{w|Air pollution}} || Research paper by The Centre for Development Economics at Delhi School of Economics indicates that {{w|Delhi Metro}} helps reduce vehicular {{w|air pollution}}.<ref>{{cite web |title=Delhi Metro helps reduce vehicular air pollution, indicates research |url=https://www.indiatoday.in/india/north/story/delhi-metro-helps-reduce-vehicular-air-pollution-delhi-school-of-economics-160315-2013-04-28 |website=indiatoday.in |accessdate=9 May 2019}}</ref>
