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| 1940s || {{w|Air pollution}} || Crisis || {{w|Los Angeles}}, becomes one of the first cities to experience severe air pollution problems then called “gas attacks.”<ref name="History of Air Pollution">{{cite web |title=History of Air Pollution |url=https://nptel.ac.in/courses/105102089/air%20pollution%20(Civil)/Module-1/1.htm |website=nptel.ac.in |accessdate=15 May 2019}}</ref> || {{w|United States}}
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| 1946 || {{w|Water pollution}}, {{w|radioactive waste}} || Crisis || {{w|Ocean disposal of radioactive waste}}: First dumping operation takes splace at Northeast Pacific Ocean (about 80 km off the coast of {{w|California}}). <ref name="Ocean Dumping of Nuclear Waste"/> || {{w|United States}}
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| 1948 || {{w|Air pollution}} || Crisis || The worst single incident of air pollution in the United States occurs in {{w|Donora, Pennsylvania}}, when severe industrial air pollution create a deadly smog. 20 people die and over 7,000 are injured.<ref>{{cite book | author=Davis, Devra | title=When Smoke Ran Like Water: Tales of Environmental Deception and the Battle Against Pollution|publisher=Basic Books|year=2002|isbn=978-0-465-01521-4}}</ref><ref name="Water and Air Pollution"/> || {{w|United States}}
| 1994 || {{w|Plastic pollution}}, {{w|water pollution}} || Research || Study of the {{w|seabed}} using {{w|trawl net}}s in the North-Western {{w|Mediterranean}} around the coasts of Spain, France, and Italy reports mean concentrations of debris of 1,935 items per square kilometer. Plastic debris accounted for 77%, of which 93% was plastic bags.<ref name=UNEP>{{cite web |url=http://www.unep.org/regionalseas/marinelitter/publications/docs/anl_oview.pdf |title=Marine Litter: An analytical overview |accessdate=1 August 2008 |year=2005 |publisher=United Nations Environment Programme |deadurl=no |archiveurl=http://webarchive.loc.gov/all/20070717141400/http://www.unep.org/regionalseas/marinelitter/publications/docs/anl_oview.pdf |archivedate=17 July 2007 |df=dmy-all }}</ref> ||
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| 1994 (February 20) || {{w|Water pollution}}, {{w|radioactive waste}} || Policy || Total prohibition of {{w|ocean disposal of radioactive waste}} comes into force by international treaties. <ref name="Ocean Dumping of Nuclear Waste">{{cite web |title=Ocean Dumping of Nuclear Waste |url=http://large.stanford.edu/courses/2017/ph241/jones-a2/ |website=large.stanford.edu |accessdate=23 May 2019}}</ref> ||
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| 1995 || General || Organization || The British {{w|Environment Agency}} is formed.<ref>{{cite web |title=ENVIRONMENT AGENCY |url=https://stormlamp.org.uk/%E2%80%A2environment-agency |website=stormlamp.org.uk |accessdate=15 May 2019}}</ref> ||
