Acid rain - wikipedia Acid rain For other uses, see Acid rain ( disambiguation ). Processes involved in acid deposition ( note that only SO and NO play a significant role in acid rain ). Acid clouds can grow on SO emissions from refineries, as seen here in Curaçao. Acid rain is a rain or any other form of precipitation that is unusually acidic, meaning that it has elevated levels of hydrogen ions ( low pH ). It can have harmful effects on plants, aquatic animals and infrastructure. Acid rain is caused by emissions of sulfur dioxide and nitrogen oxide, which react with the water molecules in the atmosphere to produce acids. Some governments have made efforts since the 1970s to reduce the release of sulfur dioxide and nitrogen oxide into the atmosphere with positive results. Nitrogen oxides can also be produced naturally by lightning strikes, and sulfur dioxide is produced by volcanic eruptions. Acid rain has been shown to have adverse impacts on forests, freshwaters and soils, killing insect and aquatic life - forms, causing paint to peel, corrosion of steel structures such as bridges, and weathering of stone buildings and statues as well as having impacts on human health. Contents 1 Definition 2 History 2.1 In the United States 3 Emissions of chemicals leading to acidification 3.1 Natural phenomena 3.2 Human activity 4 Chemical processes 4.1 Gas phase chemistry 4.2 Chemistry in cloud droplets 5 Acid deposition 5.1 Wet deposition 5.2 Dry deposition 6 Adverse effects 6.1 Surface waters and aquatic animals 6.2 Soils 6.3 Forests and other vegetation 6.4 Ocean acidification 6.5 Human health effects 6.6 Other adverse effects 7 Affected areas 8 Prevention methods 8.1 Technical solutions 8.2 International treaties 8.3 Emissions trading 9 See also 10 References 11 External links Definition `` Acid rain '' is a popular term referring to the deposition of a mixture from wet ( rain, snow, sleet, fog, cloudwater, and dew ) and dry ( acidifying particles and gases ) acidic components. Distilled water, once carbon dioxide is removed, has a neutral pH of 7. Liquids with a pH less than 7 are acidic, and those with a pH greater than 7 are alkaline. `` Clean '' or unpolluted rain has an acidic pH, but usually no lower than 5.7, because carbon dioxide and water in the air react together to form carbonic acid, a weak acid according to the following reaction : H O ( l ) + C O ( g ) ⇌ H C O ( aq ) Carbonic acid then can ionize in water forming low concentrations of hydronium and carbonate ions : H O ( l ) + H C O ( aq ) ⇌ H C O ( aq ) + H O ( aq ) However, unpolluted rain can also contain other chemicals which affect its pH ( acidity level ). A common example is nitric acid produced by electric discharge in the atmosphere such as lightning. Acid deposition as an environmental issue ( discussed later in the article ) would include additional acids other than H C O. History The corrosive effect of polluted, acidic city air on limestone and marble was noted in the 17th century by John Evelyn, who remarked upon the poor condition of the Arundel marbles. Since the Industrial Revolution, emissions of sulfur dioxide and nitrogen oxides into the atmosphere have increased. In 1852, Robert Angus Smith was the first to show the relationship between acid rain and atmospheric pollution in Manchester, England. Though acidic rain was discovered in 1853, it was not until the late 1960s that scientists began widely observing and studying the phenomenon. The term `` acid rain '' was coined in 1872 by Robert Angus Smith. Canadian Harold Harvey was among the first to research a `` dead '' lake. Public awareness of acid rain in the U.S increased in the 1970s after The New York Times published reports from the Hubbard Brook Experimental Forest in New Hampshire of the myriad deleterious environmental effects shown to result from it. Occasional pH readings in rain and fog water of well below 2.4 have been reported in industrialized areas. Industrial acid rain is a substantial problem in China and Russia and areas downwind from them. These areas all burn sulfur - containing coal to generate heat and electricity. The problem of acid rain has not only increased with population and industrial growth, but has become more widespread. The use of tall smokestacks to reduce local pollution has contributed to the spread of acid rain by releasing gases into regional atmospheric circulation. Often deposition occurs a considerable distance downwind of the emissions, with mountainous regions tending to receive the greatest deposition ( simply because of their higher rainfall ). An example of this effect is the low pH of rain which falls in Scandinavia. In the United States Since 1998, Harvard University wraps some of the bronze and marble statues on its campus, such as this `` Chinese stele '', with waterproof covers every winter, in order to protect them from corrosion caused by acid rain and acid snow The earliest report about acid rain in the United States was from the chemical evidence from Hubbard Brook Valley. In 1972, a group of scientists including Gene Likens discovered the rain that was deposited at White Mountains of New Hampshire was acidic. The pH of the sample was measured to be 4.03 at Hubbard Brook. The Hubbard Brook Ecosystem Study followed up with a series of research that analyzed the environmental effects of acid rain. Acid rain that mixed with stream water at Hubbard Brook was neutralized by the alumina from soils. The result of this research indicates the chemical reaction between acid rain and aluminum leads to increasing rate of soil weathering. Experimental research was done to examine the effects of increased acidity in stream on ecological species. In 1980, a group of scientists modified the acidity of Norris Brook, New Hampshire, and observed the change in species ' behaviors. There was a decrease in species diversity, an increase in community dominants, and a decrease in the food web complexity. In 1980, the U.S. Congress passed an Acid Deposition Act. This Act established an 18 - year assessment and research program under the direction of the National Acidic Precipitation Assessment Program ( NAPAP ). NAPAP looked at the entire problem from a scientific perspective. It enlarged a network of monitoring sites to determine how acidic the precipitation actually was, and to determine long - term trends, and established a network for dry deposition. It looked at the effects of acid rain and funded research on the effects of acid precipitation on freshwater and terrestrial ecosystems, historical buildings, monuments, and building materials. It also funded extensive studies on atmospheric processes and potential control programs. From the start, policy advocates from all sides attempted to influence NAPAP activities to support their particular policy advocacy efforts, or to disparage those of their opponents. For the U.S. Government 's scientific enterprise, a significant impact of NAPAP were lessons learned in the assessment process and in environmental research management to a relatively large group of scientists, program managers and the public. In 1981, the National Academy of Sciences was looking into research about the controversial issues regarding acid rain. President Ronald Reagan did not place a huge attention on the issues of acid rain until his personal visit to Canada and confirmed that Canadian border suffered from the drifting pollution from smokestacks in Midwest of US. Reagan honored the agreement to Canadian Prime Minister Pierre Trudeau 's enforcement of anti-pollution regulation. In 1982, US President Ronald Reagan commissioned William Nierenberg to sit on National Science Board. Nierenberg selected scientists including Gene Likens to sit on a panel to draft a report on acid rain. In 1983, the panel of scientists came up with a draft report, which concluded that acid rain is a real problem and solutions should be sought. White House Office of Science and Technology Policy reviewed the draft report and sent Fred Singer 's suggestions of the report, which cast doubt on the cause of acid rain. The panelists revealed rejections against Singer 's positions and submitted the report to Nirenberg in April. In May 1983, the House of Representatives voted against legislations that aimed to control sulfur emissions. There was a debate about whether Nierenberg delayed to release the report. Nierenberg himself denied the saying about his suppression of the report and explained that the withheld of the report after the House 's vote was due to the fact that the report was not ready to be published. In 1991, DENR provided its first assessment of acid rain in the United States. It reported that 5 % of New England Lakes were acidic, with sulfates being the most common problem. They noted that 2 % of the lakes could no longer support Brook Trout, and 6 % of the lakes were unsuitable for the survival of many species of minnow. Subsequent Reports to Congress have documented chemical changes in soil and freshwater ecosystems, nitrogen saturation, decreases in amounts of nutrients in soil, episodic acidification, regional haze, and damage to historical monuments. Meanwhile, in 1989, the U.S. Congress passed a series of amendments to the Clean Air Act. Title IV of these amendments established the Acid Rain Program, a cap and trade system designed to control emissions of sulfur dioxide and nitrogen oxides. Title IV called for a total reduction of about 10 million tons of SO emissions from power plants. It was implemented in two phases. Phase I began in 1995, and limited sulfur dioxide emissions from 110 of the largest power plants to a combined total of 8.7 million tons of sulfur dioxide. One power plant in New England ( Merrimack ) was in Phase I. Four other plants ( Newington, Mount Tom, Brayton Point, and Salem Harbor ) were added under other provisions of the program. Phase II began in 2000, and affects most of the power plants in the country. During the 1990s, research continued. On March 10, 2005, the EPA issued the Clean Air Interstate Rule ( CAIR ). This rule provides states with a solution to the problem of power plant pollution that drifts from one state to another. CAIR will permanently cap emissions of SO and NO in the eastern United States. When fully implemented, CAIR will reduce SO emissions in 28 eastern states and the District of Columbia by over 70 % and NO emissions by over 60 % from 2003 levels. Overall, the program 's cap and trade program has been successful in achieving its goals. Since the 1990s, SO emissions have dropped 40 %, and according to the Pacific Research Institute, acid rain levels have dropped 65 % since 1976. Conventional regulation was used in the European Union, which saw a decrease of over 70 % in SO emissions during the same time period. In 2007, total SO emissions were 8.9 million tons, achieving the program 's long - term goal ahead of the 2010 statutory deadline. In 2007 the EPA estimated that by 2010, the overall costs of complying with the program for businesses and consumers would be $1 billion to $2 billion a year, only one fourth of what was originally predicted. Forbes says : In 2010, by which time the cap and trade system had been augmented by the George W. Bush administration 's Clean Air Interstate Rule, SO2 emissions had fallen to 5.1 million tons. The term Citizen science can be traced back as far as January 1989 and a campaign by the Audubon Society to measure Acid rain. Scientist Muki Haklay cites in a policy report for the Wilson Center entitled ' Citizen Science and Policy : A European Perspective ' a first use of the term ' citizen science ' by R. Kerson in the magazine MIT Technology Review from January 1989. Quoting from the Wilson Center report : `` The new form of engagement in science received the name `` citizen science ''. The first recorded example of the use of the term is from 1989, describing how 225 volunteers across the US collected rain samples to assist the Audubon Society in an acid - rain awareness raising campaign. The volunteers collected samples, checked for acidity, and reported back to the organization. The information was then used to demonstrate the full extent of the phenomenon. '' Emissions of chemicals leading to acidification The most important gas which leads to acidification is sulfur dioxide. Emissions of nitrogen oxides which are oxidized to form nitric acid are of increasing importance due to stricter controls on emissions of sulfur containing compounds. 70 Tg ( S ) per year in the form of SO comes from fossil fuel combustion and industry, 2.8 Tg ( S ) from wildfires and 7 -- 8 Tg ( S ) per year from volcanoes. Natural phenomena The principal natural phenomena that contribute acid - producing gases to the atmosphere are emissions from volcanoes. Thus, for example, fumaroles from the Laguna Caliente crater of Poás Volcano create extremely high amounts of acid rain and fog, with acidity as high as a pH of 2, clearing an area of any vegetation and frequently causing irritation to the eyes and lungs of inhabitants in nearby settlements. Acid - producing gasses are also created by biological processes that occur on the land, in wetlands, and in the oceans. The major biological source of sulfur containing compounds is dimethyl sulfide. Nitric acid in rainwater is an important source of fixed nitrogen for plant life, and is also produced by electrical activity in the atmosphere such as lightning. Acidic deposits have been detected in glacial ice thousands of years old in remote parts of the globe. Soils of coniferous forests are naturally very acidic due to the shedding of needles, and the results of this phenomenon should not be confused with acid rain. Human activity The coal - fired Gavin Power Plant in Cheshire, Ohio The principal cause of acid rain is sulfur and nitrogen compounds from human sources, such as electricity generation, factories, and motor vehicles. Electrical power generation using coal is among the greatest contributors to gaseous pollutions that are responsible for acidic rain. The gases can be carried hundreds of kilometers in the atmosphere before they are converted to acids and deposited. In the past, factories had short funnels to let out smoke but this caused many problems locally ; thus, factories now have taller smoke funnels. However, dispersal from these taller stacks causes pollutants to be carried farther, causing widespread ecological damage. Chemical processes Combustion of fuels produces sulfur dioxide and nitric oxides. They are converted into sulfuric acid and nitric acid. Gas phase chemistry In the gas phase sulfur dioxide is oxidized by reaction with the hydroxyl radical via an intermolecular reaction : SO + OH → HOSO which is followed by : HOSO + O → HO + SO In the presence of water, sulfur trioxide ( SO ) is converted rapidly to sulfuric acid : SO ( g ) + H O ( l ) → H SO ( aq ) Nitrogen dioxide reacts with OH to form nitric acid : This shows the process of the air pollution being released into the atmosphere and the areas that will be affected. NO + OH → HNO Chemistry in cloud droplets When clouds are present, the loss rate of SO is faster than can be explained by gas phase chemistry alone. This is due to reactions in the liquid water droplets. Hydrolysis Sulfur dioxide dissolves in water and then, like carbon dioxide, hydrolyses in a series of equilibrium reactions : SO ( g ) + H O ⇌ SO H O SO H O ⇌ H + HSO HSO ⇌ H + SO Oxidation There are a large number of aqueous reactions that oxidize sulfur from S ( IV ) to S ( VI ), leading to the formation of sulfuric acid. The most important oxidation reactions are with ozone, hydrogen peroxide and oxygen ( reactions with oxygen are catalyzed by iron and manganese in the cloud droplets ). Acid deposition Wet deposition Wet deposition of acids occurs when any form of precipitation ( rain, snow, and so on. ) removes acids from the atmosphere and delivers it to the Earth 's surface. This can result from the deposition of acids produced in the raindrops ( see aqueous phase chemistry above ) or by the precipitation removing the acids either in clouds or below clouds. Wet removal of both gases and aerosols are both of importance for wet deposition. Dry deposition Acid deposition also occurs via dry deposition in the absence of precipitation. This can be responsible for as much as 20 to 60 % of total acid deposition. This occurs when particles and gases stick to the ground, plants or other surfaces. Adverse effects Acid rain has been shown to have adverse impacts on forests, freshwaters and soils, killing insect and aquatic life - forms as well as causing damage to buildings and having impacts on human health. Surface Waters and aquatic animals This chart shows that not all fish, shellfish, or the insects that they eat can tolerate the same amount of acid ; for example, frogs can tolerate water that is more acidic ( i.e., has a lower pH ) than trout. Both the lower pH and higher aluminium concentrations in surface water that occur as a result of acid rain can cause damage to fish and other aquatic animals. At pHs lower than 5 most fish eggs will not hatch and lower pHs can kill adult fish. As lakes and rivers become more acidic biodiversity is reduced. Acid rain has eliminated insect life and some fish species, including the brook trout in some lakes, streams, and creeks in geographically sensitive areas, such as the Adirondack Mountains of the United States. However, the extent to which acid rain contributes directly or indirectly via runoff from the catchment to lake and river acidity ( i.e., depending on characteristics of the surrounding watershed ) is variable. The United States Environmental Protection Agency 's ( EPA ) website states : `` Of the lakes and streams surveyed, acid rain caused acidity in 75 % of the acidic lakes and about 50 % of the acidic streams ''. Soils Soil biology and chemistry can be seriously damaged by acid rain. Some microbes are unable to tolerate changes to low pH and are killed. The enzymes of these microbes are denatured ( changed in shape so they no longer function ) by the acid. The hydronium ions of acid rain also mobilize toxins such as aluminium, and leach away essential nutrients and minerals such as magnesium. 2 H ( aq ) + Mg ( clay ) ⇌ 2 H ( clay ) + Mg ( aq ) Soil chemistry can be dramatically changed when base cations, such as calcium and magnesium, are leached by acid rain thereby affecting sensitive species, such as sugar maple ( Acer saccharum ). Forests and other vegetation Acid rain can have severe effects on vegetation. A forest in the Black Triangle in Europe. Adverse effects may be indirectly related to acid rain, like the acid 's effects on soil ( see above ) or high concentration of gaseous precursors to acid rain. High altitude forests are especially vulnerable as they are often surrounded by clouds and fog which are more acidic than rain. Other plants can also be damaged by acid rain, but the effect on food crops is minimized by the application of lime and fertilizers to replace lost nutrients. In cultivated areas, limestone may also be added to increase the ability of the soil to keep the pH stable, but this tactic is largely unusable in the case of wilderness lands. When calcium is leached from the needles of red spruce, these trees become less cold tolerant and exhibit winter injury and even death. Ocean acidification Main article : Ocean acidification This section needs expansion. You can help by adding to it. ( July 2013 ) Acid rain has a much less harmful effect on the oceans. However, acid rain can cause the oceans acidity to rise, making it more difficult for different coastal species to create their exoskeletons that they need to survive. These coastal species link together as part of the ocean 's food chain and without them being a source for other marine life to feed off of more marine life will die. Coral 's limestone skeletal is sensitive to pH drop, because the calcium carbonate, core component of the limestone dissolves in acidic ( low pH ) solutions. Human health effects Acid rain does not directly affect human health. The acid in the rainwater is too dilute to have direct adverse effects. However, the particulates responsible for acid rain ( sulfur dioxide and nitrogen oxides ) do have an adverse effect. Increased amounts of fine particulate matter in the air do contribute to heart and lung problems including asthma and bronchitis. Other adverse effects Effect of acid rain on statues Acid rain and weathering Acid rain can damage buildings, historic monuments, and statues, especially those made of rocks, such as limestone and marble, that contain large amounts of calcium carbonate. Acids in the rain react with the calcium compounds in the stones to create gypsum, which then flakes off. CaCO ( s ) + H SO ( aq ) ⇌ CaSO ( s ) + CO ( g ) + H O ( l ) The effects of this are commonly seen on old gravestones, where acid rain can cause the inscriptions to become completely illegible. Acid rain also increases the corrosion rate of metals, in particular iron, steel, copper and bronze. Affected areas Places significantly impacted by acid rain around the globe include most of eastern Europe from Poland northward into Scandinavia, the eastern third of the United States, and southeastern Canada. Other affected areas include the southeastern coast of China and Taiwan. Prevention methods Technical solutions Many coal - firing power stations use flue - gas desulfurization ( FGD ) to remove sulfur - containing gases from their stack gases. For a typical coal - fired power station, FGD will remove 95 % or more of the SO in the flue gases. An example of FGD is the wet scrubber which is commonly used. A wet scrubber is basically a reaction tower equipped with a fan that extracts hot smoke stack gases from a power plant into the tower. Lime or limestone in slurry form is also injected into the tower to mix with the stack gases and combine with the sulfur dioxide present. The calcium carbonate of the limestone produces pH - neutral calcium sulfate that is physically removed from the scrubber. That is, the scrubber turns sulfur pollution into industrial sulfates. In some areas the sulfates are sold to chemical companies as gypsum when the purity of calcium sulfate is high. In others, they are placed in landfill. However, the effects of acid rain can last for generations, as the effects of pH level change can stimulate the continued leaching of undesirable chemicals into otherwise pristine water sources, killing off vulnerable insect and fish species and blocking efforts to restore native life. Fluidized bed combustion also reduces the amount of sulfur emitted by power production. Vehicle emissions control reduces emissions of nitrogen oxides from motor vehicles. International treaties A number of international treaties on the long - range transport of atmospheric pollutants have been agreed for example, the 1985 Helsinki Protocol on the Reduction of Sulphur Emissions under the Convention on Long - Range Transboundary Air Pollution. Canada and the US signed the Air Quality Agreement in 1991. Most European countries and Canada have signed the treaties. Emissions trading Main article : Emissions trading See also : Acid Rain Program In this regulatory scheme, every current polluting facility is given or may purchase on an open market an emissions allowance for each unit of a designated pollutant it emits. Operators can then install pollution control equipment, and sell portions of their emissions allowances they no longer need for their own operations, thereby recovering some of the capital cost of their investment in such equipment. The intention is to give operators economic incentives to install pollution controls. The first emissions trading market was established in the United States by enactment of the Clean Air Act Amendments of 1990. The overall goal of the Acid Rain Program established by the Act is to achieve significant environmental and public health benefits through reductions in emissions of sulfur dioxide ( SO ) and nitrogen oxides ( NO ), the primary causes of acid rain. To achieve this goal at the lowest cost to society, the program employs both regulatory and market based approaches for controlling air pollution. See also Basic precipitation Gene Likens List of environmental issues Lists of environmental topics Ocean acidification Rain dust ( an alkaline rain ) References Jump up ^ Likens, Gene E. ; Keene, William C. ; Miller, John M. ; Galloway, James N. ( 1987 ). `` Chemistry of precipitation from a remote, terrestrial site in Australia ''. Journal of Geophysical Research. 92 : 13299. Bibcode : 1987JGR... 9213299L. doi : 10.1029 / JD092iD11p13299. Jump up ^ E.S. de Beer, ed. 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Jump up ^ `` Acid Rain - Green Education Foundation GEF Sustainability Education ''. www.greeneducationfoundation.org. Retrieved 2017 - 11 - 02. Jump up ^ Clean Air Act Amendments of 1990, 42 U.S. Code 7651 External links Wikimedia Commons has media related to Acid rain. National Acid Precipitation Assessment Program Report -- a 98 - page report to Congress ( 2005 ) Acid rain for schools Acid rain for schools -- Hubbard Brook Acid Rain Retirement Fund environmental education links about acid rain United States Environmental Protection Agency -- New England Acid Rain Program ( superficial ) Acid Rain ( more depth than ref. above ) U.S. Geological Survey -- What is acid rain ? Acid rain analysis -- freeware for simulation and evaluation of titration curves and pH calculations CBC Digital Archives -- Acid Rain : Pollution and Politics Larssen, Thorjørn et al. `` Acid Rain in China ''. Environmental Science and Technology, 40 : 2, 2006, pp 418 -- 425. Acid Rain : A Continuing National Tragedy -- a report from The Adirondack Council on acid rain in the Adirondack region ( 1998 ) Assortment of Summaries on Acid Rain Acid rain linked to decline of the wood thrush, a songbird of the Eastern Forest Trouble in the Forest, a 1988 documentary hosted by David Suzuki What Happens to Acid Rain ? Acid Rain and how it affects fish and other aquatic organisms Pollution Air pollution Acid rain Air quality index Atmospheric dispersion modeling Chlorofluorocarbon Indoor air quality Global dimming Global distillation Global warming Ozone depletion Atmospheric particulate matter Smog Water pollution Environmental impact of pharmaceuticals and personal care products Environmental impact of shipping Environmental monitoring Eutrophication Freshwater environmental quality parameters Groundwater pollution Hypoxia Marine debris Marine pollution Ocean acidification Oil spill Septic tank Surface runoff Thermal pollution Turbidity Urban runoff Wastewater Water quality Water stagnation Waterborne diseases Soil contamination Bioremediation Electrical resistance heating Herbicide Open defecation Pesticide Phytoremediation Soil Guideline Values ( SGVs ) Radioactive contamination Actinides in the environment Bioremediation of radioactive waste Environmental radioactivity Fission product Nuclear fallout Plutonium in the environment Radiation poisoning Radium in the environment Uranium in the environment Other types of pollution Land degradation Light pollution Pollution from nanomaterials Noise pollution Radio spectrum pollution Urban heat island Visual pollution Inter-government treaties Basel Convention CLRTAP Kyoto Protocol MARPOL Convention Montreal Protocol OSPAR Rotterdam Convention Stockholm Convention Major organizations Basel Action Network Central Pollution Control Board ( India ) DEFRA Environment Agency ( England and Wales ) Scottish Environment Protection Agency U.S. EPA European Environment Agency Greenpeace GND : 4179239 - 7 NDL : 00575484 Retrieved from `` https://en.wikipedia.org/w/index.php?title=Acid_rain&oldid=808846590 '' Categories : Environmental chemistry Pollution Forest pathology Rain Hidden categories : Webarchive template wayback links All articles with dead external links Articles with dead external links from October 2016 Articles with permanently dead external links Articles with dead external links from June 2017 Wikipedia indefinitely semi-protected pages Wikipedia indefinitely move - protected pages Articles to be expanded from July 2013 All articles to be expanded Articles using small message boxes Wikipedia articles with GND identifiers Talk View source Contents About Wikipedia Afrikaans Aragonés অসমীয়া Azərbaycanca বাংলা Беларуская Беларуская ( тарашкевіца ) ‎ Български Bosanski Català Čeština Cymraeg Dansk Deutsch Eesti Ελληνικά Español Esperanto Euskara فارسی Français Gaeilge Galego 贛 語 한국어 Հայերեն हिन्दी Hrvatski Bahasa Indonesia Interlingua Íslenska Italiano עברית ಕನ್ನಡ ქართული Қазақша Kiswahili Kreyòl ayisyen Кыргызча Latina Latviešu Lietuvių Magyar Македонски മലയാളം Bahasa Melayu Монгол Nederlands नेपाली 日本 語 Norsk Norsk nynorsk Occitan ଓଡ଼ିଆ ਪੰਜਾਬੀ Polski Português Română Русский संस्कृतम् Sardu Scots Shqip සිංහල Simple English Slovenčina Slovenščina Српски / srpski Srpskohrvatski / српскохрватски Basa Sunda Suomi Svenska தமிழ் తెలుగు ไทย Türkçe Українська Tiếng Việt Winaray Yorùbá 粵語 Zazaki 中文 Edit links This page was last edited on 5 November 2017, at 15 : 38. 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Question: when was the term acid rain first used
Answer: 1852