Smog
Smog is a type of air pollutant; the word "smog" is a combination of smoke and fog. Classic smog results from large amounts of coal burning in an area and is caused by a mixture of smoke and sulfur dioxide.
London is where it first happened. Coal fires are now illegal in London, and trains are driven by other fuels. In cities like Los Angeles it is the exhaust fumes of cars which cause the smog.
Delhi is supposed to be the most polluted city on Earth.[1] Smogs cause lung diseases and increase the death rate. According to one estimate, air pollution causes the death of about 10,500 people in Delhi every year.[2][3][4]
Peking (Beijing) is another city where air pollution is serious.[5] Car emissions and coal burning are the main reasons for their pollution. They also get pollution from some neighbouring regions, due to the pattern of air movement in the area.
Smog Media
Fanhe Town 10 day interval contrast
The photochemical smog formation diagram. (Based on U 6.3.3 in mrgsciences.com)
Airplane used to collect airborne hydrocarbons, May 1972
The presence of smog in California is shown near the Golden Gate Bridge. The brown coloration is due to the NO2 formed from photochemical smog reactions.
Highland Park Optimist Club wearing smog-gas masks at banquet, Los Angeles, circa 1954
During the autumn and spring months, some 500 million tons of rice and wheat crop residues are burnt, and winds blow from India's north and northwest towards east. This aerial view shows India's annual crop burning, resulting in smoke and air pollution over Delhi and adjoining areas.
Dense smog blankets Connaught Place, New Delhi
Victorian London was notorious for its thick smogs, or "pea-soupers", a fact that is often recreated (as here) to add an air of mystery to a period costume drama
Grease filter hood after 4 days at Italian city polluted air in winter (all surface was white)
Situated in a valley, and relying heavily on automobiles, Mexico City often suffers from poor air quality.
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References
- ↑ "Delhi is most polluted city in world, Beijing much better: WHO study". Hindustan Times. http://www.hindustantimes.com/india-news/delhi-has-dirtiest-air-china-data-foggy-who/article1-1216605.aspx. Retrieved 8 May 2014.
- ↑ Delhi's air has become a lethal hazard and nobody seems to know what to do about it. Time magazine. http://world.time.com/2014/02/10/smog-in-new-delhi/. Retrieved 10 February 2014.
- ↑ "India's air pollution triggers comparisons with China". Voice of America. Archived from the original on 25 December 2018. Retrieved 20 February 2014.
- ↑ A Delhi particular. http://www.economist.com/blogs/banyan/2012/11/air-pollution-india. Retrieved 6 November 2012.
- ↑ J.R. McNeill 2000. Something new under the Sun: an environmental history of the 20th-century world. New York: Norton, 2000, ISBN 978-0-14-029509-2.