With an increasing pollution problem, Indian government is making various steps to control the menace. According to Hindustan Times, the Supreme court has appointed Environment Pollution (Prevention and Control) Authority (EPCA) of Delhi and NCR to stop the sale and registration of new vehicles, which don't comply with BS IV emission norms.
Earlier in October 2015, the Road and Transport Ministry had issued a draft notice to make BS IV norms mandatory for four wheelers manufactured on or after April 2017. In the draft notice, it was said that the mass emission standards will come into force in a phased manner. According to the Government, the phased manner plans for BS-IV emission norms are applicable in states like Jammu and Kashmir except Leh and Kargil districts, Punjab, Haryana, Himachal Pradesh, Uttarakhand and some parts Rajasthan and Uttar Pradesh from October 2015. The remaining parts of the country will be covered by April 2017.
Bharat Stage norms are similar to the European regulations. According to a study by ARAI, BS-IV norms set the emission limit at 1.00g/km of carbon, .10 Hydrocarbon, .08 of NOx( nitrogen oxide) for petrol engines, while for diesel engines, emission norms allow .50g/km of carbon, .25 of Nox ( nitrogen oxide), .30 for HC + Nox and .025 of particulate matter.
The Government is also planning to introduce the Bharat Stage VI norms by April 2020. The transport ministry has also initiated a process known as Conformity of Production (COP). In this, process they have employed the testing agencies, which will collect 50 percent of samples to check whether they comply BS VI emission norms.