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Explain briefly on air pollution episodes of London smog and Bhopal gas tragedy?

(DEC. 2011, DEC 2013/JAN 2014 ,JUNE / JULY 12, JUNE / JULY13 1 JUNE /

Asked On2017-05-17 16:42:25 by:manjarimattur

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Another Form of smog is called industrial smog. This smog is created by burning coal and heavy oil that contains sulphur impurities in power plants, industrial plants, etc. The smog consists mostly of a mixture of SO 2 and Fog. Suspended droplets of H2SO4 were formed from some of the SO2and a variety of suspended particulate matter. This smog is common during the winter in cities such as London [Dee 1952], Chicago, Pitts burg, when the cities burned large amounts of coal and heavy oil without control over the emissions, large scale problems were witnessed.
In 1952, London, 4000 people died as a result of this type of smog. Today heavy oil and coal are burned only in large boilers and with reasonably good control of tall Chimneys so that industrial smog is less of a problem.
However Some countries such as China, Poland Czechoslovakia and some other Eastern European countries still burn Largequantities of coal without using adequate controlling measures.
Modern Technological developments have multiplied the hazards to which human beings are exposes, Nearly 5 Million chemicals have been synthesized in the world during the last 40 years and some 50,000 to 70,000 chemicals are used extensively in million of different commercial products without the availability of proper taxi logical information on the majority of the chemicals. On the fateful night on 2-12-1984, and in the early hours of 3-12-1984 more than 1 million residents of Bhopal, Capital of M.P India reported irritation of eyes that quickly became unbearable, followed by the death dancing in their residences.
A cloud of poisonous gas was released from the Union Carbide Factory. The plant was a pesticide manufacturing unit owned by Union Carbide India Ltd, a subsidiary of Union Carbide, a leading company based in the USA. The factory was licensed to produce Methyl, Isocyanite (MIC) i.e CH3NCO, an extremely hazardous chemical which is used in the manufacture of several pesticides like SEVIN CARBARYL and TEMIR-106. MIC is also used by various organic industries as an intermediate.
CO obtained by partial oxidation of coal is combined with chlorine gas in the presence of activated carbon to form phosgene (COCL2). Phosgene and Methylamine combine to The carbide plant has three storage tanks for MIC,each capable of holding 45 tonnes. The Union Carbide manual on standard operating procedure warns that if water leaks into the system, it results in the evolution of a lot of gas and liberation of heat.
This is precisely what had happened on the fateful day of 2ndDecember 1984.

Answerd on:2015-01-17 Answerd By:Nikhil-bharadwaj

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