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Since the industrial revolution, large amounts of pollutants have been released into the atmosphere.
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OPEN BOOK PAPER Since the industrial revolution, large amounts of pollutants have been released into the atmosphere. Consequently, photochemical oxidants are causing smog, acid rain is being formed, the greenhouse effect is increasing and ozone (O3) is being depleted from the stratosphere. Releasing large quantities of harmful pollutants, fuel-burning vehicles and coal-fired power stations are major sources of pollution. A direct effect of pollutants is photochemical smog containing primary and secondary pollutants, which is usually seen as a haze in summer. 'Primary pollutants are released directly into the atmosphere by various processes such as combustion of fuels in cars and power stations.'(1) Secondary pollutants form when primary pollutants react with each other or with other compounds in the air. The major component of photochemical smog is ozone, a secondary pollutant. The main primary and secondary pollutants are listed in Table 1. Table 1: Primary & secondary pollutants formed as a...
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