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| 1990s || Reforms on environmental laws are introduced. Since then, for the first time in Indian history, major air pollutant concentrations would drop in every 5 year period.<ref name="History of pollution in India"/> {{w|Sulfur dioxide}} levels in Indian cities start declining due to a fuel shift from biomass-based fuels to {{w|liquefied petroleum gas}}, and from {{w|coal}} to {{w|kerosene}}.<ref name="So, how polluted is India’s air, really?"/>
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| 2000s || More regulations are introduced during the decade. However, pollution continues to be a serious issue. {{w|Sulfur dioxide}} emissions increase, and water pollution remain concerning. The Delhi’s pollution control program becomes the basis for other cities to adopt similar efforts as heavily polluted Indian cities are identified in the mid-decade.<ref name="Pathways for Developing a Natural Gas Vehicle Market">{{cite web |title=Pathways for Developing a Natural Gas Vehicle Market |url=https://www.csis.org/analysis/pathways-developing-natural-gas-vehicle-market |website=csis.org |accessdate=14 June 2019}}</ref>
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| 1999 || || {{w|Noise pollution}} || Policy || A draft of Noise Pollution (Control and Regulation) Rules is published under the notification of the Government of India in the Ministry of Environment and Forests.<ref name="Implementation of Noise Rules">{{cite web |title=Implementation of Noise Rules |url=http://cpcb.nic.in/noise-pollution-rules/ |website=cpcb.nic.in |accessdate=10 June 2019}}</ref>
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| 1999 || || General || Policy || The Supreme Court of India adopts {{w|Delhi}}’s pollution control program, designed by the Environment Pollution (Prevention and Control) Authority. The Delhi program becomes the basis for other cities to adopt similar efforts.<ref name="Pathways for Developing a Natural Gas Vehicle Market"/>
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| 1999 || || {{w|Air pollution}} || Policy || The Indian Government introduces the first-ever fuel specifications based on environmental considerations, the push for higher emission standards.<ref name="In India, Can the World’s Cleanest Fuel Clear the Air?">{{cite web |last1=Srivastava |first1=Deepali |title=In India, Can the World’s Cleanest Fuel Clear the Air? |url=https://nextcity.org/features/view/in-delhi-can-the-worlds-cleanest-fuel-clear-the-air |website=nextcity.org |accessdate=12 June 2019}}</ref>
| 2005–2014 || || {{w|Air pollution}} || Research || Data from Nasa’s [[w:Aura (satellite)|Aura]] satellite shows that total {{w|sulfur dioxide}} emissions over India have nearly doubled in the period.<ref name="So, how polluted is India’s air, really?">{{cite web |last1=Bhuyan |first1=Ragini |title=So, how polluted is India’s air, really? |url=https://www.livemint.com/ |website=livemint.com |accessdate=12 June 2019}}</ref>
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| 2006–2008 || || {{w|Water polution}} || Research || In 2006, 47 percent of water quality monitoring reports [[w:Coliform bacteria|coliform ]] concentration above 500 MPN/100 ml. By 2008, 33 percent of all water quality monitoring stations would report a total coliform level exceeding those levels, suggesting efforts to add pollution control infrastructure and upgrade treatment plants in India, which may be reversing the water pollution trend.<ref name=cpcb2008>{{cite web|title=Central Pollution Control Board, India, Annual Report 2008–2009|year=2009|publisher=Central Pollution Control Board, Ministry of Environment & Forests, Govt of India|url=http://cpcb.nic.in/upload/AnnualReports/AnnualReport_37_ANNUAL_REPORT-08-09.pdf}}</ref>
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| 2007 || November || {{w|Air pollution}} || Research || A 25-year-long study on 27,000 children finds that 50% Bangalore kids are hit by {{w|asthma}}.<ref>{{cite web |title=50% Bangalore kids hit by asthma |url=https://timesofindia.indiatimes.com/city/bangalore/50-Bangalore-kids-hit-by-asthma/articleshow/2520601.cms?referral=PM |website=timesofindia.indiatimes.com |accessdate=24 May 2019}}</ref>
| 2007 || || {{w|Water pollution}} || Research || A study finds that discharge of untreated sewage is the single most important cause of pollution of surface and groundwater in the country.<ref name="Water Pollution and Abatement">{{cite book |last1=Chakraborty |first1=Debesh |last2=Mukhopadhyay |first2=Kakali |title=Water Pollution and Abatement Policy in India: A Study from an Economic Perspective |url=https://books.google.com.ar/books?id=iOclBAAAQBAJ&pg=PA30&dq=A+study+finds+that+discharge+of+untreated+sewage+is+the+single+most+important+cause+of+pollution+of+surface+and+groundwater+in+the+country.&hl=en&sa=X&ved=0ahUKEwioju-_meTiAhUQK7kGHTQXBYIQ6AEIKjAA#v=onepage&q=A%20study%20finds%20that%20discharge%20of%20untreated%20sewage%20is%20the%20single%20most%20important%20cause%20of%20pollution%20of%20surface%20and%20groundwater%20in%20the%20country.&f=false}}</ref>
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| 2008 || || {{w|Water pollution}} || Research || A joint study by {{w|PGIMER}} and Punjab Pollution Control Board ireveals that in villages along the Nullah, {{w|fluoride}}, {{w|mercury}}, beta-{{w|endosulphan}} and {{w|heptachlor}} pesticide are more than permissible limit (MPL) in ground and tap water. Plus the water has high concentration of chemical and biochemical oxygen demand, {{w|ammonia}}, {{w|phosphate}}, {{w|chloride}}, {{w|chromium}}, {{w|arsenic}} and {{w|chlorpyrifos}} pesticide. The ground water also contains {{w|nickel}} and {{w|selenium}}, while the tap water has high concentration of {{w|lead}}, nickel and {{w|cadmium}}.<ref name=ex>{{cite news|url=http://www.expressindia.com/latest-news/buddha-nullah-the-toxic-vein-of-malwa/312236/|title=Buddha Nullah the toxic vein of Malwa|date=May 21, 2008|work=Indian Express}}</ref>
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| 2008 || || {{w|Water pollution}} || Research || Study reports wastewater generation in urban India to be 38,254 million liters per day, out of which 26,467 million liters per day was untreated.<ref name="Water Pollution and Abatement"/>
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| 2009 || February 20 || {{w|Water pollution}} || Organization || The {{w|National Ganga River Basin Authority}} is established by the Central Government of India. It also declares {{w|Ganges}} as the "National River" of India.<ref name="NRGBA">[http://moef.nic.in/modules/recent-initiatives/NGRBA/index.html "National Ganga River Basin Authority"]</ref><ref name="NGRBATeam">[http://moef.nic.in/modules/recent-initiatives/NGRBA/PolicyMaking.html "Composition of NGRBA."]</ref>
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| 2009 || || {{w|Water pollution}} || Program || The Indian Government establishes the National Ganga River Basin Authority (NGRBA) and initiates the "Mission Clean Ganga". The program in supported by the {{w|World Bank}} with one billion dollars.<ref name="Environment and Pollution in"/>
| 2013 || September || {{w|Air pollution}} || Research || Study on non-smokers finds that Indians have 30% lower lung function compared to Europeans.<ref name="TOISep2">{{cite news|title = Indians have 30% weaker lungs than Europeans|url = http://timesofindia.indiatimes.com/home/science/Indians-have-30-weaker-lungs-than-Europeans-Study/articleshow/22217540.cms|newspaper = {{w|Times of India}}|date = Sep 2, 2013}}</ref>
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| 2015 || April || {{w|Air pollution}} || Index release || The {{w|Government of India}}, together with {{w|IIT Kanpur}} launch the National Air Quality Index, an alert system that notifies the public about air pollution levels and associated health risks. The project aimes aims to increase public awareness.<ref>http{{cite web |title=Choking India gets air quality index |url=https://economictimes.indiatimes.com/news/environment/pollution/choking-india-gets-air-quality-index/articleshow/46830411.cms|website=economictimes.indiatimes.com |accessdate=14 June 2019}}</ref><ref name="India Announces National Air Quality Index to Increase Public Awareness">{{cite web |title=India Announces National Air Quality Index to Increase Public Awareness |url=https://www.nrdc.org/experts/anjali-jaiswal/india-announces-national-air-quality-index-increase-public-awareness |website=nrdc.org |accessdate=10 June 2019}}</ref><ref>{{cite web |title=National Air Quality Index |url=http://www.iitk.ac.in/new/index.php/national-air-quality-index |website=iitk.ac.in |accessdate=10 June 2019}}</ref>
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| 2015 || || {{w|Air pollution}} || Statistics || India overtakes the {{w|United States}} and becomes the world’s second largest coal consumer after {{w|China}}.<ref name="The Carbon Brief Profile: India"/>
| 2016 || || General || Statistics || The {{w|Environmental Performance Index}} ranks India 141 out of 180 countries.<ref name="economictimes.indiatimes.comv"/>
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| 2016 || || General || Statistics || A study by the {{w|World Health OrganisationOrganization}} reports that fourteen of the twenty world’s most polluted cities are in India.<ref>{{cite web |title=Indian cities and air pollution |url=https://www.orfonline.org/expert-speak/indian-cities-and-air-pollution-51628/ |website=orfonline.org |accessdate=12 June 2019}}</ref>
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| 2017 || || {{w|Air pollution}} || Research || Study published in {{w|The Lancet}} estimates that in the year air pollution killed 1.24 million Indians — half of them younger than 70, which lowers the country’s average life expectancy by 1.7 years. The 10 most polluted cities in the world are all in northern India.<ref name="Dirty air: how India became the most polluted country on earth">{{cite web |title=Dirty air: how India became the most polluted country on earth |url=https://ig.ft.com/india-pollution/ |website=ig.ft.com |accessdate=15 May 2019}}</ref>
