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The industrial revolution has been the central cause for the increase in pollutants in the atmosphere over the last tree centuries.

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Introduction

The industrial revolution has been the central cause for the increase in pollutants in the atmosphere over the last tree centuries. Before 1950,the majority of this pollution was created from the burning of coal for energy generation, space heating, cooking, and transportation. Under the right conditions, the smoke and sulphur dioxide produced from the burning of coal, can combine with fog to create industrial smog. In high concentration, industrial smog can be extremely toxic to humans and other living organisms. Today the use of other fossil fuel, nuclear power, and hydro electricity instead of coal has greatly reduced the occurrence of industrial smog. However, the burning of fossil fuel like gasoline can create another atmospheric pollution problem knows as photochemical smog. Photochemical smog is a condition that develops when primary pollutants interact under the influence of sunlight to produce a mixture of hundreds of different and hazardous chemical known as secondary pollutants. Photochemical smog usually occurs during early hours, when the environmentally damaging by car emission cause the level of unburnt hydrocarbons and NO to rise .The sun oxides the NO to NO2 .The NO2 is proteolyses in sunlight which means that the molecules break down again. ...read more.

Middle

The hydrocarbonis attacked by the hydroxyl radical Ohwhich cause the breakdown of hydrocarbons which can be illustrated below BPEOS at longannet was used to minims the output of particlur waste material such as SOx and NOx Have put lonanner at forefront of the development and application of new technologny to deal with these pollutants. There are two different sorts of method of lower the emission of NOx.Most large combustion plantsuses low NOx Burners.The rate of reaction increase with temperature and if the temperature of combustion of the fuel is lower ,the rate of production of thermal NOx will be less.In the low NOx burners are air is introduced to the finely ground coal to give lower remperature flames,as a result significant reduction of thermal NOx and fuel NOx. If combustion not complete maxium haet is not realeased..high temperature stem enables most efficient conversionsof heat into electrictal energy.Gas reburn is another mehod which reduces nox emission and removes Most large combustion plants now uses low NOx burners .In low NOx burner the introduction of air to the finely ground coal is controlled to give low temperature as a result reduction to the thermal NOx and fuel NOx. ...read more.

Conclusion

The pollutants are trapped closes to the ground .If an occurrence of light prevailing wind; the polluted air mass is moved from urban areas to rural regions. The highest ozone recorded was recorded over rural areas because chemical reaction producing the secondary pollutants. In 1995 the bright sunshine and still air provided the ideal condition for photochemical smog. The smog caused havoc and was very dangerous to people with asthmatics and many old and young people. As the hot weather continued, weather showed high concentration of ozone in the country. Flue gases contain oxides of nitrogen(no) for two reasons. firstly ,fuels contain compounds of nitrogen, formed from proteins contained in organism. When the fuel is burnt ,these nitrogen compounds are oxidised to form what is called fuel NOx. secondly at high temperature of combustion ,atmospheric nitrogen and oxygen combine to form what is called thermal NO x. most of the NOx emissions are thermal NOx All living organism contain compounds of sulphur and these are the origin of the sulphur found in coal. when coal burns ,the sulphur compounds are converted to oxides of sulphur (Sox).because some organism contain more sulphur than others, the amount of sulphur in coal varies according to the types of organisms from which the coal was originally formed. ...read more.

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