April 1 2020 is the deadline for all BS IV engine, after that all automakers should switch to BS VI as per new norms passed by the government. So April 1 2020 onwards all the automobile companies should stick to the emission norms of Bharat stage VI or BS VI.
Bharat stage norms are introduced to regulate the emission of vehicle pollutants. Bharat stage are norms are same as Europe's Euro norms. BS VI is same as Euro VI.
From BS IV to BS VI change is in the extent of sulphur content in the emission. BS IV contains 50 parts per million(ppm) of sulphur and BS VI contains only 10 ppm of sulphur.
To implement this upgrade, automobile companies has to invest more. Due to this upgrade the cost of the vehicle also will increase. Ultimately, the buyer has to spend more from pocket.
Premium car segments have started making BS VI complaint vehicles.
Maruti Suzuki will start with Ertiga and followed by S-cross and Brezza
With this new norms introduction, some of models will be discontinued. The models that are going to be discontinued are Maruti omni, Tata Nano, Bolt, Zest, Sumo, Indigo, Fiat Punto, Linea and Avventura (Fiat is now Fiat Chrysler will concentrate on its brand Jeep).