Question

measures taken if emitted gases are above 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 follows
i) 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 as
CaCO3 + 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 

Answer 2

Answer:

Explanation:

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 follows

i) 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 as

CaCO3 + 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