Air pollution in India

2022-06-19T19:13:14Z

96.242.2.185:

{{short description|Air pollution in India}}
{{Use Indian English|date=February 2016}}
[[File:Sources_of_Air_Pollution.png|thumb|294x294px|Dust & Construction contribute about 59% to the air pollution in India, which is followed by Waste Burning. Dust & Construction activities are mostly in the urban areas while Waste Burning is in the rural areas (agriculture).]]
[[Air pollution]] in [[India]] is a serious environmental issue.<ref>{{Cite web|url=https://energy.economictimes.indiatimes.com/etanalytics/reports/coal/state-of-global-air-2019/640|title=State of global air 2019|access-date=29 April 2019}}</ref> Of the 30 most polluted cities in the world, 21 were in India in 2019.<ref>{{Cite web|url=https://www.cnn.com/2020/02/25/health/most-polluted-cities-india-pakistan-intl-hnk/index.html|title=21 of the world's 30 cities with the worst air pollution are in India|first=Helen |last=Regan|website=CNN|access-date=2020-02-26}}</ref><ref>{{Cite web|url=https://www.newsy.com/stories/21-of-top-30-worst-cities-for-air-pollution-were-in-india/|title=21 Of Top 30 Air Polluted Cities Last Year Were In India|last=Lowry|first=LeeAnne|website=Newsy|language=en|access-date=2020-02-26}}</ref> As per a study based on 2016 data, at least 140 million people in India breathe air that is 10 times or more over the [[World Health Organization|WHO]] safe limit<ref>{{Cite web|url=https://ig.ft.com/india-pollution|title=Dirty air: how India became the most polluted country on earth|last1=Bernard|first1=Steven|last2=Kazmin|first2=Amy|date=December 11, 2018|website=ig.ft.com|language=en-GB|access-date=2019-03-04}}</ref> and 13 of the world's 20 cities with the highest annual levels of air pollution are in India.<ref>{{Cite web|url=https://factor.niehs.nih.gov/2018/9/feature/3-feature-india/index.htm|title=India's air pollution, health burden get NIEHS attention (Environmental Factor, September 2018)|website=National Institute of Environmental Health Sciences|language=en|access-date=2019-03-04}}</ref> 51% of the pollution is caused by industrial pollution, 27 % by vehicles, 17% by [[Stubble_burning#Stubble_burning_in_India|crop burning]] and 5% by other sources.<ref name=wall1>[https://indianexpress.com/article/cities/ahmedabad/want-govt-to-build-1600-km-green-wall-along-aravalli-says-activist-vijaypal-baghel-6182069/ Want govt to build 1600 km green wall along Aravalli], Indian Express, 24 December 2019.</ref> Air pollution contributes to the premature deaths of 2 million Indians every year. Emissions come from vehicles and industry, whereas in rural areas, much of the pollution stems from [[Energy poverty and cooking|biomass burning for cooking]] and keeping warm. In autumn and spring months, large scale crop residue burning in agriculture fields – a cheaper alternative to mechanical tilling – is a major source of smoke, smog and particulate pollution.<ref name=bksha>Badarinath, K. V. S., Kumar Kharol, S., & Rani Sharma, A. (2009), Long-range transport of aerosols from agriculture crop residue burning in Indo-Gangetic Plains—a study using LIDAR, ground measurements and satellite data. Journal of Atmospheric and Solar-Terrestrial Physics, 71(1), 112–120</ref><ref name=nasa2012>[http://earthobservatory.nasa.gov/NaturalHazards/view.php?id=79630 Agricultural Fires in India] NASA, United States (2012)</ref><ref>Bob Weinhold , [http://ehp.niehs.nih.gov/119-a386/ Fields and Forests in Flames: Vegetation Smoke damages and Human Health], National Institutes of Health</ref> India has a low per capita emissions of [[greenhouse gas]]es but the country as a whole is the third largest greenhouse gas producer after China and the United States.<ref name="iea1">{{cite web|url=http://www.iea.org/co2highlights/co2highlights.pdf|title=CO2 EMISSIONS FROM FUEL COMBUSTION HIGHLIGHTS, 2011 Edition|year=2011|publisher=International Energy Agency, France}}</ref> A 2013 study on non-smokers has found that Indians have 30% weaker lung function than 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 = Times of India|date = Sep 2, 2013}}</ref>

The [[Air (Prevention and Control of Pollution) Act]] was passed in 1981 to regulate air pollution but has failed to reduce pollution because of poor enforcement of the rules.<ref>{{Cite web|date=2020-11-10|title=Air pollution law languishes toothless when air pollution surges|url=https://india.mongabay.com/2020/11/indias-40-year-old-law-to-combat-air-pollution-languishes-as-the-crisis-intensifies/|access-date=2021-01-26|website=Mongabay-India|language=en-US}}</ref>

In 2015, Government of India, together with [[IIT Kanpur]] launched the National Air Quality Index.<ref>{{Cite news|url=https://economictimes.indiatimes.com/environment/pollution/choking-india-gets-air-quality-index/articleshow/46830411.cms|title=Choking India gets air quality index|last=Mohan|first=Vishwa|date=2015-04-07|work=The Economic Times|access-date=2019-11-09}}</ref> In 2019, India launched 'The National Clean Air Programme' with tentative national target of 20%-30% reduction in PM2.5 and PM10 concentrations by 2024, considering 2017 as the base year for comparison. It will be rolled out in 102 cities that are considered to have air quality worse than the [[National Ambient Air Quality Standards]].<ref>{{cite web|url=http://www.indiaenvironmentportal.org.in/content/460562/national-clean-air-programme-ncap/ |title=National Clean Air Programme|year=2019| access-date =18 January 2019}}</ref> There are other initiatives such as a 1,600-kilometre-long and 5-kilometre-wide [[Aravalli_Range|The Great Green Wall of Aravalli]] green ecological corridor along Aravalli range from Gujarat to Delhi which will also connect to [[Sivalik Hills|Shivalik]] hill range with planting of 1.35 billion (135 crore) new native trees over 10 years to combat the pollution.<ref name=wall1/> In December 2019, [[Indian Institute of Technology Bombay|IIT Bombay]], in partnership with the [[McKelvey School of Engineering]] of [[Washington University in St. Louis]], launched the Aerosol and Air Quality Research Facility to study air pollution in India.<ref>{{Cite web|url=https://source.wustl.edu/2019/12/new-partnership-brings-together-mckelvey-iit-bombay-to-study-air-pollution/|title=McKelvey Engineering, IIT Bombay partner to study air pollution {{!}} The Source {{!}} Washington University in St. Louis|date=2019-12-04|website=The Source|language=en-US|access-date=2020-02-14}}</ref> According to a '''Lancet study''', nearly 16.7 lakh deaths and an estimated loss of USD 28.8 billion worth of output were India's prices for worsening air pollution in 2019.<ref>{{Cite web|date=September 29, 2021|first=Piyush|last=Aggarwal|title=Will an extended ban on firecrackers help improve the air we breathe?|url=https://www.indiatoday.in/diu/story/will-an-extended-ban-on-firecrackers-help-improve-the-air-we-breathe-1858861-2021-09-29|access-date=2021-10-13|website=India Today|language=en}}</ref>

== Causes ==
[[File:Drying cow dung.jpg|thumb|250px|Cooking fuel in rural India is prepared from a wet mix of dried grass, fuelwood pieces, hay, leaves and mostly cow/livestock dung. This mix is patted down into disc-shaped cakes, dried, and then used as fuel in stoves.This is called उपलि
. When it burns, it produces smoke and numerous indoor air pollutants <ref>{{Cite journal|last1=Stewart|first1=Gareth J.|last2=Acton|first2=W. Joe F.|last3=Nelson|first3=Beth S.|last4=Vaughan|first4=Adam R.|last5=Hopkins|first5=James R.|last6=Arya|first6=Rahul|last7=Mondal|first7=Arnab|last8=Jangirh|first8=Ritu|last9=Ahlawat|first9=Sakshi|last10=Yadav|first10=Lokesh|last11=Sharma|first11=Sudhir K.|date=2021-02-18|title=Emissions of non-methane volatile organic compounds from combustion of domestic fuels in Delhi, India|url=https://acp.copernicus.org/articles/21/2383/2021/|journal=Atmospheric Chemistry and Physics|language=English|volume=21|issue=4|pages=2383–2406|doi=10.5194/acp-21-2383-2021|bibcode=2021ACP....21.2383S|issn=1680-7316|doi-access=free}}</ref><ref>{{Cite journal|last1=Stewart|first1=Gareth J.|last2=Nelson|first2=Beth S.|last3=Acton|first3=W. Joe F.|last4=Vaughan|first4=Adam R.|last5=Farren|first5=Naomi J.|last6=Hopkins|first6=James R.|last7=Ward|first7=Martyn W.|last8=Swift|first8=Stefan J.|last9=Arya|first9=Rahul|last10=Mondal|first10=Arnab|last11=Jangirh|first11=Ritu|date=2021-02-18|title=Emissions of intermediate-volatility and semi-volatile organic compounds from domestic fuels used in Delhi, India|url=https://acp.copernicus.org/articles/21/2407/2021/|journal=Atmospheric Chemistry and Physics|language=English|volume=21|issue=4|pages=2407–2426|doi=10.5194/acp-21-2407-2021|bibcode=2021ACP....21.2407S|issn=1680-7316|doi-access=free}}</ref> at concentrations 5 times higher than coal.That's why women who lives in village and make food on this dried mixture are suffering from numerous breathing diseases.]]

=== Fuel and biomass burning isn't necessary ===
{{Further information|Energy poverty and cooking}}
[[File:The rural stove,smoky,pollution,TamilNadu-230.jpeg|thumb|250px|A rural aburo stove using biomass cakes, fuelwood and trash as cooking fuel. Surveys suggest over 100 million households in India use such stoves (चूल्हा) every day, 2–3 times a day. Clean burning fuels and electricity are unavailable in rural parts and small towns of India because of poor rural highways and limited energy generation infrastructure.]]
[[File:NP India burning 48 (6315309342).jpg|thumb|Burning of rice residues after harvest, to quickly prepare the land for wheat planting, around [[Sangrur]], [[Punjab, India]]]]

Fuel wood and [[biomass]] burning is the primary reason for [[Asian brown cloud|near-permanent haze and smoke]] observed above rural and urban India, and in satellite pictures of the country. Fuelwood and biomass cakes are used for cooking and general heating needs. These are burnt in [[Improved cookstove|cook stove]]s known as ''chullah'' or ''chulha'' piece in some parts of India. These cook stoves are present in over 100 million Indian households, and are used two to three times a day, daily. Some reports, including one by the World Health Organization, claim 300,000 to 400,000 people die of [[indoor air quality|indoor air pollution]] and carbon monoxide poisoning in India because of biomass burning and use of chullhas.<ref>{{cite web|title=Green stoves to replace chullahs|date=December 3, 2009|url=http://articles.timesofindia.indiatimes.com/2009-12-03/india/28096828_1_biomass-climate-renewable-energy-sources|archive-url=https://archive.today/20120701180244/http://articles.timesofindia.indiatimes.com/2009-12-03/india/28096828_1_biomass-climate-renewable-energy-sources|url-status=dead|work=[[The Times of India]]|archive-date=July 1, 2012}}</ref> The carbon containing gases released from biomass fuels are many times more reactive than cleaner fuels such as liquefied petroleum gas.<ref>{{Cite journal|last1=Stewart|first1=Gareth J.|last2=Nelson|first2=Beth S.|last3=Acton|first3=W. Joe F.|last4=Vaughan|first4=Adam R.|last5=Hopkins|first5=James R.|last6=Yunus|first6=Siti S. M.|last7=Hewitt|first7=C. Nicholas|last8=Nemitz|first8=Eiko|last9=Mandal|first9=Tuhin K.|last10=Gadi|first10=Ranu|last11=Sahu|first11=Lokesh K.|date=2021-02-25|title=Comprehensive organic emission profiles, secondary organic aerosol production potential, and OH reactivity of domestic fuel combustion in Delhi, India|journal=Environmental Science: Atmospheres|language=en|volume=1|issue=2|pages=104–117|doi=10.1039/D0EA00009D|issn=2634-3606|doi-access=free}}</ref> Air pollution is also the main cause of the [[Asian brown cloud]], which is delaying the start of the [[monsoon]]. The Burning of biomass and firewood will not stop until electricity or clean burning fuel and combustion technologies become reliably available and widely adopted in rural and urban India.

India is the world's largest consumer of fuelwood, agricultural waste and biomass for energy purposes. From the most recent available nationwide study, India used 148.7 million tonnes coal replacement worth of fuel-wood and biomass annually for domestic energy use. India's national average annual per capita consumption of fuel wood, agricultural waste and biomass cakes was 206 kilogram coal equivalent.<ref name="cifor2002">{{cite book|title=Fuelwood Studies in India: Myth and Reality|author =Devendra Pandey|year=2002|isbn=979-8764-92-7|publisher=Center for International Forestry Research|url=http://www.cifor.org/publications/pdf_files/Books/Fuelwood.pdf}}</ref> The overall contribution of fuelwood, including [[sawdust]] and wood waste, was about 46% of the total, the rest being agricultural waste and biomass dung cakes. Traditional fuel (fuelwood, crop residue and dung cake) dominates domestic energy use in rural India and accounts for about 90% of the total. In urban areas, this traditional fuel constitutes about 24% of the total.<ref name="cifor2002" /> India burns tenfold more fuelwood every year than the United States; the fuelwood quality in India is different from the dry firewood of the United States; and, the Indian stoves in use are less efficient, thereby producing more smoke and air pollutants per kilogram equivalent.

===Fuel adulteration===
Some Indian taxis and [[auto rickshaw|auto-rickshaws]] run on adulterated fuel blends. Adulteration of gasoline and diesel with lower-priced fuels is common in South Asia, including India.<ref name=fuela>{{cite web|title=Urban Air Pollution, Catching gasoline ad diesel adulteration|year=2002|publisher=The World Bank|url=http://www-wds.worldbank.org/external/default/WDSContentServer/WDSP/IB/2002/09/13/000094946_02083104140124/Rendered/PDF/multi0page.pdf}}</ref> Some [[adulterants]] increase emissions of harmful pollutants from vehicles, worsening urban air pollution. Financial incentives arising from differential taxes are generally the primary cause of fuel adulteration. In India and other developing countries, gasoline carries a much higher tax than diesel, which in turn is taxed more than kerosene meant as a cooking fuel, while some solvents and lubricants carry little or no tax.

As fuel prices rise, the public transport driver cuts costs by blending the cheaper [[hydrocarbon]] into highly taxed hydrocarbon. The blending may be as much as 20–30 percent. For a low wage driver, the adulteration can yield short term savings that are significant over the month. The consequences to long term air pollution, quality of life and effect on health are simply ignored. Also ignored are the reduced life of vehicle engine and higher maintenance costs, particularly if the taxi, auto-rickshaw or truck is being rented for a daily fee.

Adulterated fuel increases [[tailpipe emissions]] of hydrocarbons (HC), carbon monoxide (CO), [[Nitrogen oxide|oxides of nitrogen]] (NO<sub>x</sub>) and particulate matter (PM). Air toxin emissions — which fall into the category of unregulated emissions — of primary concern are benzene and polyaromatic hydrocarbons (PAHs), both well-known carcinogens. Kerosene is more difficult to burn than gasoline, its addition results in higher levels of HC, CO and
PM emissions even from catalyst-equipped cars. The higher sulfur level of kerosene is another issue.

===Traffic congestion===
[[Traffic congestion]] is severe in India's cities and towns.<ref>{{Cite journal|last1=Akbar|first1=Prottoy A.|last2=Couture|first2=Victor|last3=Duranton|first3=Gilles|last4=Ghani|first4=Ejaz|last5=Storeygard|first5=Adam|date=August 2018|title=Mobility and Congestion in Urban India|url=https://documents.worldbank.org/curated/en/811261533850020988/pdf/WPS8546.pdf|journal=Macroeconomics, Trade and Investment Global Practice|publisher=World Bank Group}}
*{{lay source |template=cite news |author=Varun B. Krishnan |date=23 November 2018 |title=How fast does traffic move in your city? |url=https://www.thehindu.com/opinion/op-ed/how-fast-does-traffic-move-in-your-city/article25570594.ece |newspaper=The Hindu}}</ref> Traffic congestion is caused by several reasons, some of which are: increase in number of vehicles per kilometre of available roads, a lack of intra-city divided-lane highways and intra-city expressways networks, lack of inter-city expressways, traffic accidents and chaos due to poor enforcement of traffic laws.

Traffic congestion reduces the average traffic speed. At low speeds, scientific studies reveal that vehicles burn fuel inefficiently and pollute more per trip. For example, a study in the United States found that for the same trip, cars consumed more fuel and polluted more if the traffic was congested, than when traffic flowed freely. An average trip speeds between 20 and 40 kilometres per hour, the cars pollutant emission was twice as much as when the average speed was 55 to 75 kilometres per hour. At average trip speeds between 5 and 20 kilometres per hour, the cars pollutant emissions were 4 to 8 times as much as when the average speed was 55 to 70 kilometres per hour.<ref>{{cite journal|title=Real-World CO2 Impacts of Traffic Congestion |journal=Transportation Research Record: Journal of the Transportation Research Board |author1=Matthew Barth |author2=Kanok Boriboonsomsin |date=November 2009 |doi=10.3141/2058-20 |volume=2058 |pages=163–171 |s2cid=2173204 |url=http://trb.metapress.com/content/n622635366032635/ |url-status=dead |archive-url=https://web.archive.org/web/20160530124628/http://trb.metapress.com/content/n622635366032635/ |archive-date=2016-05-30 }}</ref> Fuel efficiencies similarly were much worse with traffic congestion.

Traffic gridlock in Delhi and other Indian cities is extreme.<ref>{{cite web|title=Gridlocked Delhi: six years of career lost in traffic jams|date=September 5, 2010|publisher=India Today|url=http://indiatoday.intoday.in/story/gridlocked-delhi-six-years-of-career-lost-in-jams/1/111506.html}}</ref> This has been shown to result in a build up of local pollution, particularly under stagnent conditions.<ref>{{Cite journal|last1=Stewart|first1=Gareth J.|last2=Nelson|first2=Beth S.|last3=Drysdale|first3=Will S.|last4=Acton|first4=W. Joe F.|last5=Vaughan|first5=Adam R.|last6=Hopkins|first6=James R.|last7=Dunmore|first7=Rachel E.|last8=Hewitt|first8=C. Nicholas|last9=Nemitz|first9=Eiko|last10=Mullinger|first10=Neil|last11=Langford|first11=Ben|date=2020-08-13|title=Sources of non-methane hydrocarbons in surface air in Delhi, India|journal=Faraday Discussions|volume=226|pages=409–431|language=en|doi=10.1039/D0FD00087F|pmid=33336656|issn=1364-5498|doi-access=free}}</ref> The average trip speed on many Indian city roads is less than 20 kilometres per hour; a 10-kilometre trip can take 30 minutes, or more. At such speeds, vehicles in India emit air pollutants 4 to 8 times more than they would with less traffic congestion; Indian vehicles also consume a lot more carbon footprint fuel per trip, than they would if the traffic congestion was less. Emissions of particles and heavy metals increase over time because the growth of the fleet and mileage outpaces the efforts to curb emissions.<ref name="kumari">{{cite journal |last1=Kumari |first1=R |last2=Attri |first2=AK |last3=Panis |first3=LI |last4=Gurjar |first4=BR |title=Emission estimates of particulate matter and heavy metals from mobile sources in Delhi (India). |journal=Journal of Environmental Science & Engineering |date=April 2013 |volume=55 |issue=2 |pages=127–42 |pmid=25464689 }}</ref>

In cities like [[Bangalore]], around 50% of children suffer from [[asthma]].<ref>{{cite news| url=http://articles.timesofindia.indiatimes.com/2007-11-06/bangalore/27982035_1_asthma-school-buses-traffic-schools | archive-url=https://archive.today/20120729144212/http://articles.timesofindia.indiatimes.com/2007-11-06/bangalore/27982035_1_asthma-school-buses-traffic-schools | url-status=dead | archive-date=29 July 2012 | work=[[The Times of India]] | title=50% Bangalore kids hit by asthma | date=6 November 2007}}</ref>

=== Greenhouse gas emissions ===
{{excerpt|Greenhouse gas emissions by India}}

== Effects ==

=== Health costs of air pollution ===
[[File:Reasons_for_Concern.png|thumb|427x427px|Asthma is the leading health problem faced by Indians. Not surprisingly, it accounts for more than 50% of the health problems caused by air pollution.]]
The most important reason for concern over the worsening air pollution in the country is its effect on the health of individuals. Exposure to [[particulates|particulate matter]] for a long time can lead to respiratory and cardiovascular diseases such as asthma, bronchitis, [[Chronic obstructive pulmonary disease|COPD]], lung cancer and heart attack.<ref>{{Cite web |date=2021-04-24 |title=Air Pollution in India – A Brief Highlight |url=https://www.downtoearth.org.in/blog/air/air-pollution-in-india-has-caused-losses-of-up-to-rs-7-lakh-crore-annually-76616 |access-date=2021-05-26}}</ref> The [[Global Burden of Disease Study]] for 2010, published in 2013, had found that outdoor air pollution was the fifth-largest killer in India and around 620,000 early deaths occurred from air pollution-related diseases in 2010.<ref name="livemint">{{Cite web|url=https://www.livemint.com/Home-Page/Rz6u3kb13mDuXNzezwagAI/Emission-panel-for-panIndia-shift-to-Bharat-Stage-V-fuel-by.html|title=Emission panel for pan-India shift to Bharat Stage V fuel by 2020|last1=Rao|first1=Kirthi V.|last2=Raj|first2=Amrit|date=2014-05-12|website=livemint.com|language=en|access-date=2019-08-17|last3=Sethi|first3=Neha}}</ref> According to a WHO study, 13 of the 20 most-polluted cities in the world are in India; however, the accuracy and methodology of the WHO study was questioned by the Government of India.<ref name="livemint" /> India also has one of the highest number of [[Chronic obstructive pulmonary disease|COPD]] patients and the highest number of deaths due to COPD.

Over a million Indians die prematurely every year due to air pollution, according to the non-profit Health Effects Institute.<ref name=AP>{{cite news | title=US exporting dirty fuel to pollution-choked India | publisher=Bay Area News Group |work=San Jose Mercury-News |page=A4 |author1=Tammy Webber | author2=Katy Daigle |agency=AP}}</ref> Over two million children—half the children in Delhi—have abnormalities in their lung function, according to the Delhi Heart and Lung Institute.<ref name=AP/> Over the past decade air pollution has increased in India significantly. Asthma is the most common health problem faced by Indians and it accounts for more than half of the health issues caused by air pollution.<ref>{{cite journal |last=Bhome |first=Arvind B. |date=2012-06-14 |title=COPD in India: Iceberg or volcano? |journal=Journal of Thoracic Disease |volume=4 |issue=3 |pages=298–309–309 |doi=10.3978/j.issn.2072-1439.2012.03.15 |pmc=3378191 |pmid=22754670 }}</ref><ref>{{Cite news|url=https://www.thehindu.com/news/cities/chennai/chennais-air-quality-pretty-bad-says-respiratory-physician/article29889578.ece|title=Chennai's air quality pretty bad, says respiratory physician|date=2019-11-05|work=The Hindu|access-date=2019-11-09|language=en-IN|issn=0971-751X}}</ref>

The Global Burden of Disease Study of 2017 analysed in a report by The Lancet indicated that 76.8% of Indians are exposed to higher ambient particulate matter over 40 μg/m<sup>3</sup>, which is significantly above the national limit recommenced by national guidelines on ambient air pollution.
The study estimated that of 480.7 million Disability-Adjusted Life Years in India 4.4% of could be ascribed to ambient particulate matter pollution and 15.8 million of them were the result of polluted air in households. In terms of average life expectancy it is suggested that average life expectancy in India would increase by 1.7 years if exposure was limited to national minimum recommendations.<ref>{{cite journal |last1=Balakrishnan |first1=K |title=The impact of air pollution on deaths, disease burden, and life expectancy across the states of India: the Global Burden of Disease Study 2017 |journal=The Lancet Planetary Health |date=January 1, 2019 |volume=1 |issue=3 |pages=e26–e39 |doi=10.1016/S2542-5196(18)30261-4 |pmid=30528905 |pmc=6358127 |doi-access=free }}</ref>

Ambient air pollution in India is estimated to cause 670,00 deaths annually and particularly aggravates respiratory and cardiovascular conditions including chronic bronchitis, lung cancer and asthma. Ambient air pollution is linked to an increase in hospital visits, with a higher concentration of outdoor pollution particulates resulting in emergency room visit increases of between 20 and 25% for a range of conditions associated with higher exposure to air pollution. Approximately 76% of households in rural India are reliant on solid biomass for cooking purposes which contributes further to the disease burden of ambient air pollution experienced by the population of India.<ref>{{cite journal |last1=Rajak |first1=Rahul |title= Short and long-term exposure to ambient air pollution and impact on health in India: a systematic review7 |journal= International Journal of Environmental Health Research |date=May 9, 2019 |volume=1 |issue=25 |pages=593–617 |doi=10.1080/09603123.2019.1612042 |pmid=31070475 |s2cid=148570538 }}</ref>

=== State-Wide Trends ===
According to the WHO, India has14 out of the 15 most polluted cities in the world in terms of PM 2.5 concentrations. Other Indian cities that registered very high levels of PM2.5 pollutants are Delhi, Patna, Agra, Muzaffarpur, Srinagar, Gurgaon, Jaipur, Patiala and Jodhpur, followed by Ali Subah Al-Salem in Kuwait and a few cities in China and Mongolia.<ref>{{Cite web|url=https://timesofindia.indiatimes.com/india/india-tops-world-in-bad-air-quality-kanpur-delhi-among-top-15-mumbai-4th-most-polluted-megacity/articleshow/63997130.cms|title=India tops world in bad air quality: Kanpur, Delhi among 15 worst cities, Mumbai 4th most polluted megacity - Times of India|website=The Times of India|access-date=2019-03-09}}</ref>

[[Air quality index|Air Quality Index]] (AQI) is a number used to communicate the level of pollution in the air and it essentially tells you the level of pollution in the air in a given city on a given day. The AQI of Delhi was placed under the "severe-plus category" when it touched 574, by the System of Air Quality and Weather Forecasting And Research.<ref>{{Cite news|url=https://www.indiatoday.in/india/story/delhi-smog-air-pollution-diwali-firecrackers-1384147-2018-11-08|title=Delhi records worst air quality of year after rampantly bursting crackers|newspaper=India Today|language=en|access-date=2019-03-13|agency=Ist}}</ref> In May 2014 the World Health Organization announced [[New Delhi]] as the most polluted city in the world.<ref>{{Cite news|url=http://qz.com/281251/here-is-why-india-has-no-clue-how-bad-its-air-pollution-problem-is/|title=Here is why India has no clue how bad its air pollution problem is|last=Madhok|first=Madhok|date=16 October 2014|access-date=December 4, 2015|publisher=Quartz India}}</ref> In November 2016, the [[Great smog of Delhi]] was an environmental event which saw New Delhi and adjoining areas in a dense blanket of smog, which was the worst in 17 years.
[[File:2018 Air Pollution in NewDelhi (PM2.5 AQI).svg|thumb|900px|centre|2018 Air Pollution in New Delhi (PM2.5 AQI). A surge on June 14 was caused by dust storms brought on by a combination of extreme heat and powerful downdraft winds.<ref>{{cite web |title=New Delhi's Air Pollution Went Off the Scale This Week|url=https://earther.gizmodo.com/new-delhis-air-pollution-went-off-the-scale-this-week-1826866425 |date=15 June 2018}}</ref>{{Columns-start}}{{legend|#7e0023| Hazardous}}{{legend|#8F3F97| Very Unhealthy }} {{legend|#ff0000| Unhealthy }}{{Column}} {{legend|#ff7e00| Unhealthy for Sensitive Groups }} {{legend|#ffff00| Moderate}} {{legend|#00E400|Good}} {{Columns-end}}]]
{| class="wikitable"
|+Top 13 Cities in India with the highest level of PM 2.5
!Cities
!PM2.5 Levels
|-
|Delhi
|153
|-
|Patna
|149
|-
|Gwalior
|144
|-
|Raipur
|134
|-
|Ahmedabad
|100
|-
|Lucknow
|96
|-
|Firozabad
|96
|-
|Kanpur
|93
|-
|Amritsar
|92
|-
|Ludhiana
|91
|-
|Prayagraj
|88
|-
|Agra
|88
|-
|Khanna
|88
|}
India's [[Central Pollution Control Board]] now routinely monitors four air pollutants namely sulphur dioxide (SO2), oxides of nitrogen (NOx), suspended particulate matter (SPM) and respirable particulate matter (PM10). These are target air pollutants for regular monitoring at 308 operating stations in 115 cities/towns in 25 states and 4 Union Territories of India. The monitoring of meteorological parameters such as wind speed and direction, relative humidity and temperature has also been integrated with the monitoring of air quality. The monitoring of these pollutants is carried out for 24 hours (4-hourly sampling for gaseous pollutants and 8-hourly sampling for particulate matter) with a frequency of twice a week, to yield 104 observations in a year.

The key findings of India's central pollution control board are:<ref>{{cite web|title=NATIONAL AIR QUALITY MONITORING PROGRAMME|year=2011|publisher=Ministry of Environment & Forests, Government of India|url=http://cpcbenvis.nic.in/airpollution/finding.htm}}</ref>

*Most Indian cities continue to violate India's and world air quality PM10 targets. Respirable particulate matter pollution remains a key challenge for India. Despite the general non-attainment, some cities showed far more improvement than others. A decreasing trend has been observed in PM10 levels in cities like Solapur and Ahmedabad over the last few years. This improvement may be due to local measures taken to reduce Sulphur in diesel and stringent enforcement by the government.
*A decreasing trend has been observed in Sulphur dioxide levels in residential areas of many cities such as [[Delhi]], [[Mumbai]], [[Lucknow]], [[Bhopal]] during last few years. The decreasing trend in Sulphur dioxide levels may be due to recently introduced clean fuel standards, and the increasing use of LPG as domestic fuel instead of coal or fuelwood, and the use of CNG instead of diesel in certain vehicles.
*A decreasing trend has been observed in nitrogen dioxide levels in residential areas of some cities such as Bhopal and Solapur during last few years.
*Most Indian cities greatly exceed acceptable levels of suspended particulate matter. This may be because of refuse and biomass burning, vehicles, power plant emissions, industrial sources.
*The Indian air quality monitoring stations reported lower levels of PM10 and suspended particulate matter during monsoon months possibly due to wet deposition and air scrubbing by rainfall. Higher levels of particulates were observed during winter months possibly due to lower mixing heights and more calm conditions. In other words, India's air quality worsens in winter months, and improves with the onset of monsoon season.
*The average annual [[Air pollution|SOx and NOx]] emissions level and periodic violations in industrial areas of India were significantly and surprisingly lower than the emission and violations in residential areas of India
*Of the four major Indian cities, air pollution was consistently worse in [[Delhi]], every year over 5-year period (2004–2018). [[Kolkata]] was a close second, followed by [[Mumbai]]. [[Chennai]] air pollution was least of the four.

== Steps taken ==

* The government in Delhi launched an Odd-Even Rule in November, 2017 which is based on the [[Odd–even rationing|Odd-Even rationing]] method: This meant that cars running with number plates ending in Odd digits could only be driven on certain days of the week, while the Even digit cars could be driven on the remaining days of the week.<ref>{{Cite web|url=https://www.carandbike.com/news/odd-even-in-delhi-5-things-you-need-to-know-1773720|title=Odd-Even Rule: 5 Things You Need to Know - NDTV CarAndBike|website=CarAndBike|language=en|access-date=2019-03-13}}</ref>
* Local governments of various states also implemented measures such as tighter vehicle emissions' norms, higher penalties for burning rubbish and better control of road dust.
* The Indian government has committed to a 50% reduction in households using solid fuel for cooking<ref>{{Cite journal|title=WHO {{!}} India takes steps to curb air pollution|journal=Bulletin of the World Health Organization|year=2016|volume=94|issue=7|pages=487–8|doi=10.2471/BLT.16.020716|pmid=27429486|pmc=4933146|doi-access=free}}</ref>
*Some goals set for future are:
**Clean up the transportation sector by introducing 1,000 electric public transport buses to its existing 550 busses.
**Upgrade all fossil fuel combustion engine vehicles to BS6 emission standards
** Meet a goal of 25% of private vehicles to be electricity powered by 2023
** Renewable energy in all power plants
** Provide farmers with a machine called a [[Happy seeder|Happy Seeder]] which converts agricultural residue to fertilizer
** Analyze health data and study the efficiency of different room filtration systems in areas where indoor air pollution is highest.
** Identify effective ways to inform the public about air pollution data
** Launch new citizen science programs to better document exposures<ref>{{Cite web|url=https://cen.acs.org/environment/pollution/Searching-solutions-Delhis-air-pollution/97/i7|title=Searching for solutions to Delhi's air pollution problem|website=Chemical & Engineering News|language=en|access-date=2019-03-09}}</ref>
**Reduce Carbon Emissions: "According to Inter-governmental Panel on Climate Change, to limit warming well below 2 degree Celsius, CO2 emissions should decline by about 20 per cent by 2030 and reach net zero around 2075; to limit warming below 1.5 degree Celsius, CO2 emissions should decline by 50 per cent by 2030 and reach net zero by around 2050..."<ref name=Express>{{Cite web|url=https://indianexpress.com/article/india/india-drives-global-rise-in-co2-emissions-report-5480529/|title=India drives global rise in CO2 emissions: Report|date=2018-12-06|website=The Indian Express|language=en-IN|access-date=2019-03-13}}</ref>

==See also==
* [[Air pollution in Delhi]]
* [[List of Kerala cities by ambient air quality]]
* [[Auto rickshaw#Fuel efficiency and pollution|Hydrogen internal combustion engine auto rickshaw]]
* [[Dimethyl ether|BioDME]]: low-pollution fuel for diesel generators
* [[Steam reforming]] of natural gas with [[methane pyrolysis]]: CO2-neutral hydrogen production from natural gas
* [[Petroleum coke]]
* [[List of most-polluted cities by particulate matter concentration|List of most-polluted cities]]
* [[Criteria air pollutants]]

==References==
{{reflist|30em}}

==Further reading==
* {{cite web|last1=Sengupta|first1=Ramprasad|last2=Mandal|first2=Subrata|title=Health Damage Cost of Automotive Air Pollution : Cost Benefit Analysis of Fuel Quality Upgradation for Indian Cities|url=http://www.nipfp.org.in/media/medialibrary/2013/04/wp05_nipfp_039.pdf|access-date=22 July 2014 |ref=none}}
* {{cite web|last1=Cropper|first1=Maureen|title=The Health Effects of Coal Electricity Generation in India|url=http://www.hks.harvard.edu/m-rcbg/rpp/RFF-DP-12-25.pdf|access-date=22 July 2014|date=June 2012 |ref=none}}

== External links ==

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Air pollution in India