Great smog of London - wikipedia Great smog of London Great Smog of London Nelson 's Column during the Great Smog of 1952 Date 5 to 9 December 1952 Location London, England Coordinates Coordinates : 51 ° 30 ′ 25 '' N 0 ° 07 ′ 37 '' W ﻿ / ﻿ 51.507 ° N 0.127 ° W ﻿ / 51.507 ; - 0.127 Casualties 10,000 dead 200,000 medical conditions The Great Smog of London, or Great Smog of 1952, was a severe air - pollution event that affected the British capital of London in early December 1952. A period of cold weather, combined with an anticyclone and windless conditions, collected airborne pollutants -- mostly arising from the use of coal -- to form a thick layer of smog over the city. It lasted from Friday, 5 December to Tuesday, 9 December 1952 and then dispersed quickly when the weather changed. It caused major disruption by reducing visibility and even penetrating indoor areas, far more severe than previous smog events experienced in the past, called `` pea - soupers ''. Government medical reports in the following weeks, however, estimated that up until 8 December, 4,000 people had died as a direct result of the smog and 100,000 more were made ill by the smog 's effects on the human respiratory tract. More recent research suggests that the total number of fatalities was considerably greater ; about 6,000 more died in the following months as a result of the event. London had suffered since the 13th century from poor air quality, which worsened in the 1600s, but the Great Smog is known to be the worst air - pollution event in the history of the United Kingdom, and the most significant in terms of its effect on environmental research, government regulation, and public awareness of the relationship between air quality and health. It led to several changes in practices and regulations, including the Clean Air Act 1956. Contents 1 Background 1.1 Sources of pollution 1.2 Weather 2 Effects 2.1 Effect on London 2.2 Health effects 2.3 Environmental impact 3 Cause 4 In popular culture 5 See also 6 References 7 Further reading 8 External links Background Sources of pollution Battersea Power Station, pictured in 2012 The cold weather preceding and during the Great Smog led Londoners to burn more coal than usual to keep themselves warm. Post-war domestic coal tended to be of a relatively low - grade, sulphurous variety ( economic necessity meant that better - quality `` hard '' coals tended to be exported ), which increased the amount of sulphur dioxide in the smoke. There were also numerous coal - fired power stations in the Greater London area, including Fulham, Battersea, Bankside, Greenwich and Kingston upon Thames, all of which added to the pollution. According to the UK 's Met Office, the following pollutants were emitted each day during the smoggy period : 1,000 tonnes of smoke particles, 140 tonnes of hydrochloric acid, 14 tonnes of fluorine compounds, and 370 tonnes of sulphur dioxide which may have been converted to 800 tonnes of sulphuric acid. Research suggests that additional pollution - prevention systems fitted at Battersea may have worsened the air quality, reducing the output of soot at the cost of increased sulphur dioxide, though this is not certain. Additionally, there was pollution and smoke from vehicle exhaust -- particularly from steam locomotives and diesel - fuelled buses, which had replaced the recently abandoned electric tram system -- and from other industrial and commercial sources. Weather On 4 December 1952, an anticyclone settled over a windless London, causing a temperature inversion with cold, stagnant air trapped under a layer ( or `` lid '' ) of warm air. The resultant fog, mixed with smoke from home and industrial chimneys, particulates such as those from motor vehicle exhausts, and other pollutants such as sulphur dioxide, formed a persistent smog, which blanketed the capital the following day. The presence of tarry particles of soot gave the smog its yellow - black colour, hence the nickname `` pea - souper ''. The absence of significant wind prevented its dispersal and allowed an unprecedented accumulation of pollutants. Effects Effect on London Although London was accustomed to heavy fogs, this one was denser and longer - lasting than any previous fog. Visibility was reduced to a few metres ( `` It 's like you were blind '' ) making driving difficult or impossible. Public transport ceased, apart from the London Underground, and the ambulance service stopped, forcing users to transport themselves to hospital. The smog was so dense that it even seeped indoors, resulting in cancellation or abandonment of concerts and film screenings as visibility decreased in large enclosed spaces, and stages and screens became harder to see from the seats. Outdoor sports events were also cancelled. In the inner London suburbs and away from town centres, there was no disturbance by moving traffic to thin out the dense fog in the back streets. The result was that visibility could be down to a metre or so in the daytime. Walking out of doors became a matter of shuffling one 's feet to feel for potential obstacles such as road kerbs. This was made even worse at night since each back street lamp at the time was fitted with an incandescent light - bulb, which gave no penetrating light onto the pavement for pedestrians to see their feet, or even the lamp post. Fog - penetrating fluorescent lamps did not become widely available until later in the 1950s. `` Smog masks '' were worn by those who were able to purchase them from chemists. Near railway lines, on which `` fog working '' was implemented, loud explosions similar to a shotgun shot were common. The explosions were made by `` detonators '' -- a form of large percussion cap placed on the track and activated by the wheels of trains. These devices were placed by certain signals to provide an audible warning to match the visual indication provided by the signal for the driver. Health effects There was no panic, as London was renowned for its fog. In the weeks that ensued, however, statistics compiled by medical services found that the fog had killed 4,000 people. Most of the victims were very young or elderly, or had pre-existing respiratory problems. In February 1953, Marcus Lipton suggested in the House of Commons that the fog had caused 6,000 deaths and that 25,000 more people had claimed sickness benefits in London during that period. Mortality remained elevated for months after the fog. A preliminary report, never finalised, blamed those deaths on an influenza epidemic. Emerging evidence revealed that only a fraction of the deaths could be from influenza. Most of the deaths were caused by respiratory tract infections, from hypoxia and as a result of mechanical obstruction of the air passages by pus arising from lung infections caused by the smog. The lung infections were mainly bronchopneumonia or acute purulent bronchitis superimposed upon chronic bronchitis. More recent research suggests that the number of fatalities was considerably greater than contemporary estimates, at about 12,000. Environmental impact The death toll formed an important impetus to modern environmentalism, and it caused a rethinking of air pollution, as the smog had demonstrated its lethal potential. New regulations were implemented, restricting the use of dirty fuels in industry and banning black smoke. Environmental legislation since 1952, such as the City of London ( Various Powers ) Act 1954 and the Clean Air Acts of 1956 and 1968, led to a reduction in air pollution. Financial incentives were offered to householders to replace open coal fires with alternatives ( such as installing gas fires ), or for those who preferred, to burn coke instead which produces minimal smoke. Central heating ( using gas, electricity, oil or permitted solid fuel ) was rare in most dwellings at that time, not finding favour until the late 1960s onwards. Despite improvements, insufficient progress had been made to prevent one further smog event approximately ten years later, in early December 1962. Cause Atmospheric scientists at Texas A&M University investigating the haze of polluted air in Beijing realized their research led to a possible cause for the London event in 1952. `` By examining conditions in China and experimenting in a lab, the scientists suggest that a combination of weather patterns and chemistry could have caused London fog to turn into a haze of concentrated sulfuric acid. '' Even though research findings point in this direction, the two events are not identical. In China, the combination of nitrogen dioxide and sulfur dioxide, both produced by burning coal, with a humid atmosphere, created sulfates while building up acidic conditions that, left unchanged, would have stalled the reaction. However, ammonia from agricultural activity neutralized the acid allowing sulfate production to continue. It is theorised that in 1952 in London, the nitrogen dioxide and sulfur dioxide combined with fog rather than humidity ; larger droplets of water diluted the acid products, allowing more sulfate production as sulfuric acid. Sunrise burned off the fog, leaving concentrated acid droplets that killed citizens. In popular culture The Great Smog served as the basis of an episode titled `` Forog '' of The Goon Show ( series 5, episode 13 ), which aired on 21 December 1954. The event was a central plot line in the episode `` An Act of God '' ( season 1, episode 4 ) of the Netflix series The Crown ( released in November 2016 ). It also features prominently in Dominion, an alternate history novel by C.J. Sansom. See also 1930 Meuse Valley fog 1939 St. Louis smog 1948 Donora smog 1966 New York City smog 2013 Harbin smog 2013 Shanghai smog London low emission zone References ^ Jump up to : Bell, M.L. ; Davis, D.L. & Fletcher, T. ( 2004 ). `` A Retrospective Assessment of Mortality from the London Smog Episode of 1952 : The Role of Influenza and Pollution ''. Environ Health Perspect. 112 ( 1 ; January ) : 6 -- 8. doi : 10.1289 / ehp. 6539. PMC 1241789. PMID 14698923. CS1 maint : Uses authors parameter ( link ) Jump up ^ Brimblecombe, Peter ( 1976 ). `` Attitudes and Responses Towards Air Pollution in Medieval England ''. Journal of the Air Pollution Control Association. 26 ( 10 ) : 941 -- 45. doi : 10.1080 / 00022470.1976. 10470341. ^ Jump up to : Evelyn, John ; Pegge, Samuel, 1704 -- 1796, ( ed. ) ( 1661 ), Fumifugium, Printed by W. Godbid, retrieved 5 May 2016 CS1 maint : Multiple names : authors list ( link ) CS1 maint : Extra text : authors list ( link ) Jump up ^ Graunt, John, 1620 -- 1674 ; Petty, William, Sir, 1623 -- 1687 ( 1662 ), Natural and political observations mentioned in a following index, and made upon the bills of mortality ( microform ) / by John Graunt... ; with reference to the government, religion, trade, growth, ayre, diseases, and the several changes of the said city, Printed by Tho. Roycroft for John Martin, James Allestry, and Tho. Dicas Jump up ^ McKie, Robin & Townsend, Mark. Great Smog is history, but foul air still kills ( The Observer, 24 November 2002 ). Jump up ^ `` The Great Smog of 1952 ''. metoffice.gov.uk. Archived from the original on 3 September 2014. Retrieved 12 October 2014. ^ Jump up to : Mason, Nigel ; Hughes, Peter ; Mc Mllan, Randall. Introduction to environmental physics ( CRC, 2001 ), pp. 112 -- 13. Jump up ^ `` Atmosphere, Climate & Environment Information Programme ''. Ace.mmu.ac.uk. 4 December 1952. Archived from the original on 25 February 2009. Retrieved 30 June 2010. Jump up ^ `` Met Office Education : Teens -- Case Studies -- The Great Smog ''. Metoffice.gov.uk. Archived from the original on 5 June 2011. Retrieved 30 June 2010. Jump up ^ Greater London Authority. 50 Years On : The struggle for air quality in London since the great smog of December 1952. Jump up ^ Nielson, John. `` The Killer Fog of ' 52 ''. NPR. Retrieved 14 December 2013. Jump up ^ `` London fog clears after days of chaos ''. BBC News. Retrieved 7 December 2014. Jump up ^ `` The Great Smog of 1952 ''. metoffice.gov.uk. Retrieved 17 August 2008. Jump up ^ `` Coal : Nutty slack ''. Commons Sitting of 16 February 1953. hansard.millbanksystems.com. Jump up ^ Davis DL. 2002. When Smoke Ran Like Water. New York : Basic Books. Jump up ^ Peters, Annette ; Döring, Angela ; Wichmann, H - Erich ; Koenig, Wolfgang ( 1997 ) ' Increased plasma viscosity during an air pollution episode : a link to mortality ? ' The Lancet, 1997, Vol. 349 ( 9065 ), pp. 1582 -- 87 Jump up ^ Hunt, Andrew ; Abraham, Jerrold L ; Judson, Bret ; Berry, Colin L ( 2003 ). `` ' Toxicologic and epidemiologic clues from the characterization of the 1952 London smog fine particulate matter in archival autopsy lung tissues ' ''. Environmental Health Perspectives. 111 ( 9 ) : 1209 -- 14. doi : 10.1289 / ehp. 6114. Jump up ^ Bell ML, Davis D. 2001. Reassessment of the lethal London fog of 1952 : novel indicators of acute and chronic consequences of acute exposure to air pollution. Environ Health Perspect 109 ( suppl 3 ) : 389 -- 94. Jump up ^ Camps, Francis E ( Ed. ) ( 1976 ). Gradwohl 's Legal Medicine ( Bristol : John Wright & Sons Ltd, 3rd ed. ) ISBN 0 - 7236 - 0310 - 3. p. 236. Jump up ^ Andrew ; Abraham, Jerrold L. ; Judson, Bret ; Berry, Colin L. ( 2003 ). `` Toxicologic and Epidemiologic Clues from the Characterization of the 1952 London Smog Fine Particulate Matter in Archival Autopsy Lung Tissues Hunt ''. Environmental Health Perspectives. 111 ( 9 ) : 1209 -- 14. doi : 10.1289 / ehp. 6114. Jump up ^ Stone, R ( 2002 ). `` Counting the Cost of London 's Killer Smog ''. Science. 298 ( 5601 ) : 2106 -- 07. doi : 10.1126 / science. 298.5601. 2106b. Jump up ^ `` Choking fog spreads across Britain ''. BBC News. Retrieved 16 January 2015. Jump up ^ Domonoske, Camila ( 2016 - 11 - 23 ). `` Research On Chinese Haze Helps Crack Mystery of London 's Deadly 1952 Fog ''. NPR. Retrieved 23 November 2016. Jump up ^ `` Forog Goon Show script ''. The Goon Show Site. Retrieved 14 November 2016. Jump up ^ Dibden, Emma ( 9 November 2016 ). `` The 10 Key Moments From ' The Crown ' Season One ''. Harper 's Bazaar. Jump up ^ Samuelson, Kate ( 4 November 2016 ). `` Everything to Know About the Great Smog of 1952, as Seen on The Crown ''. Time. Further reading Bates, David V. `` Recollections of the London Fog. '' Environmental health perspectives 110.12 ( 2002 ) : A735. online Bell, Michelle L. ; Davis, Devra Lee ( June 2001 ). `` Reassessment of the Lethal London Fog of 1952 : Novel Indicators of Acute and Chronic Consequences of Acute Exposure to Air Pollution ''. Environmental Health Perspectives. 109 ( Suppl 3 ) : 389 -- 394. doi : 10.2307 / 3434786. JSTOR 3434786. Berridge, Virginia ( Ed. ). The Big Smoke : Fifty Years After the 1952 London Smog ( University of London, Institute of Historical Research, 2005 ) Brimblecombe, Peter. The Big Smoke : A History of Air Pollution in London Since Medieval Times ( Routledge Kegan & Paul, 1987 ) Davis, Devra L. `` A look back at the London smog of 1952 and the half century since. '' Environmental health perspectives 110.12 ( 2002 ) : A734. online Davis, Devra L. `` The Great Smog '' History Today ( Dec 2002 ) Vol. 52, Issue 12 Dawson, Kate Winkler. Death in the Air : The True Story of a Serial Killer, the Great London Smog, and the Strangling of a City ( Hachette Book Group, 2017 ) Greater London Authority. 50 Years On : The struggle for air quality in London since the great smog of December 1952 ( December 2002 ) Thorsheim, Peter. Inventing Pollution : Coal, Smoke, and Culture in Britain Since 1800 ( Ohio University Press, 2006 ) External links Edinburgh University : The London Smog Disaster of 1952 BBC News : Days of toxic darkness 1952 : London fog clears after days of chaos ( BBC News, 9 December 1952 ) Persistent sulfate formation from London Fog to Chinese haze PNAS Scientists finally know what caused a mysterious fog to kill 12,000 people in London in 1952 History of London Evolution Londinium Lundenwic City of London City of Westminster Middlesex County of London Greater London Timeline Periods Roman London Anglo - Saxon London Norman and Medieval London Tudor London Stuart London 18th - century London 19th - century London 1900 -- 39 The Blitz 1945 -- 2000 21st century Events Peasants ' Revolt Black Death Great Plague Great Fire 1854 cholera outbreak Great Stink Great Exhibition 1908 Franco - British Exhibition The Battle of Cable Street Festival of Britain Great Smog Coronation of Queen Elizabeth II Swinging London London Plan 1966 FIFA World Cup Final Hyde Park and Regent 's Park bombings Funeral of Princess Diana Anti-war protests 7 / 7 bombings Olympic Games ( 1908 1948 2012 ) 2012 Summer Paralympics Grenfell Tower fire Government Metropolitan Board of Works London County Council Greater London Council Greater London Authority London Assembly Mayor of London London independence Services Bow Street Runners Metropolitan Police Service London Ambulance Service London Fire Brigade Port of London Authority London sewerage system London Underground London Metropolitan Archives City of London City of London Corporation Lord Mayor of the City of London Wards of the City of London Guildhall Livery Companies Lord Mayor 's Show City of London Police Bank of England Structures St Paul 's Cathedral Tower of London Palace of Whitehall Westminster Hall London Bridge Tower Bridge Westminster Abbey Big Ben The Monument Fortifications London portal Environment portal 1950s portal Retrieved from `` https://en.wikipedia.org/w/index.php?title=Great_Smog_of_London&oldid=838786187 '' Categories : 1952 disasters in the United Kingdom 1952 health disasters 1952 in England 1952 in London 1952 in the environment Air pollution in the United Kingdom December 1952 events Disasters in London Environment of London Environmental disasters in the United Kingdom Health disasters in the United Kingdom Health in London Smog events Hidden categories : CS1 maint : Uses authors parameter CS1 maint : Multiple names : authors list CS1 maint : Extra text : authors list Use British English from October 2013 Use dmy dates from January 2016 Coordinates not on Wikidata All articles with unsourced statements Articles with unsourced statements from December 2017 Articles with unsourced statements from April 2017 Articles with unsourced statements from December 2016 Talk Contents About Wikipedia Azərbaycanca Български Català Čeština Cymraeg Deutsch Español Esperanto Euskara فارسی Français 한국어 Bahasa Indonesia Italiano עברית Nederlands 日本 語 Norsk Polski Português Română Русский Slovenščina Українська Tiếng Việt 中文 18 more Edit links This page was last edited on 29 April 2018, at 08 : 51. Text is available under the Creative Commons Attribution - ShareAlike License ; additional terms may apply. By using this site, you agree to the Terms of Use and Privacy Policy. Wikipedia ® is a registered trademark of the Wikimedia Foundation, Inc., a non-profit organization. About Wikipedia

Question: what factors led to the deadly smog in london in 1952
Answer: A period of cold weather, combined with an anticyclone and windless conditions