Question

measure taken if emitted gases are above the permissible limits

Answer 1

the main emitted gases that causes air poluution are 1. carbon monoxide ----the accepted max allowable concentration for occupational exposure is 50 ppm for 8 hours the pollution due to CO is controlled as followsi) the carburetter is adjusted as to ensure prooper air fuel ratio. the excess air presence makes complete combustion of fuel in car engines .ii) exhaust sysstem is equipped with catalytic converter whih converts CO into harmless products iii) fuel such as CNG , LNG  which release minimum qnty of pollutants on combustion are aadvised to be used in place of gasoline 
2) SO2 gas :controll of SO2 pollutants  can be done in following manners i) by use of low sulphur content fuels such as natural gas or sulphur free fuels ii) by removal of oxides of sulphur from flue gases by using chemical scrubber like limestone , the reactioncan be represented asCaCO3 + SO2 ----> CaSO3 + CO2  etc. iii) by using alternate sources of energy such as hydroelectric power plants or nuclear power plants insteaad of thermal power plants
3) oxides of nitrogen : it can be  controlled by the following method  catalytic converters are used in automobiles which converts the vehicular exhaust to free nitrogen gas and traces of ammonia 

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Answer 2

Answer:

Few important tips to maintain low emission levels -

• Clean spark plug and maintain specified gap between electrodes.

• Keep the air filter clean.

• Get the carburetor tuned at authorized workshop.

• Do not overfill the engine oil and follow the replacement schedule.

• Avoid use of adulterated fuel.

• One should get the emission level certified once every 3 months at any of the authorized emission checking centers.

Explanation: