BS emission standards in India

Only BS-IV compliant vehicles will be sold and registered from 2017: Government

http://economictimes.indiatimes.com/industry/auto/news/industry/only-bs-iv-compliant-vehicles-will-be-sold-and-registered-from-2017-government/articleshow/48544844.cms

"NEW DELHI: Sale of four-wheelers not meeting Bharat Stage (BS)-IV emission norms will be barred in India from April 2017, with the government deciding to bring the entire country under the ambit of the tighter pollution control standard."
"The sale and registration of vehicles not meeting the new emission norms won't be allowed in the country from April 2017 and only Bharat Stage compliant four-wheeler vehicles will be manufactured," said a transport ministry spokesperson. 

"From April 1, 2017, the mass emission standards for Bharat Stage IV shall come into force all over the country," the road transport & highways ministry said in a statement. "With this, only those newly manufactured four-wheeler vehicles, which are compliant with the BS-IV standards, will be allowed to register and move on roads with effect from the notified dates in the notified areas."
The new norms will reduce emissions of carbon monoxide (CO),hydrocarbon (HC), oxides of nitrogen (NOx) and sulphur (SOx), which are much less in BS-IV fuel compared to BS-III fuel. 

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India is a country that has a huge population and is known for their abundance of cars and low pollution standards. As most of the population is rather poor people choose to go for the older and cheaper vehicles which pollute more. 

With banning the sales and registration of four-wheelers that do not meet the Bharat Stage IV emission norms the government is limiting the negative externalities that come with using older cars. As well as they will be helping the car sellers in India to have more business. People won't be able to buy old cars from each other any more. This decision will be good news to car manufacturers, yet for people in India it means that more saving up will probably have to be done to buy car that meet the standards. This decision of applying the new emission standards might actually decrease the level of cars in the country overall, as people now becoming old enough to drive a car, might not have enough available funds to buy a newly manufactured car that meets the standards. 

Higher priced cars with higher standards also means more money will be going to big companies that pay taxes. And more taxes means more money for the government to improve the country even further.

Yet most importantly the constant pollution rate will be decreased which therefore will raise the living qualities and possibly make India more attractive to tourists, which in return can bring in even more money in long term.