Which year did the Supreme Court of India ban the registration of diesel vehicles with engine capacity of 2000cc or more in Delhi?

The Supreme Court of India banned the registration of diesel vehicles with an engine capacity of 2000cc or more in Delhi in December 2015. The decision was taken to control air pollution levels in the city, as diesel vehicles are a major source of vehicular emissions. The ban was initially implemented for three months but was later extended. The ban was lifted in August 2016 after automakers agreed to pay a green cess on the sale of diesel cars with an engine capacity of 2000cc or more in Delhi.