Bharat stage emission standards

Bharat stage emission standards (BSES) (lit. 'India stage emission standards') are emission standards instituted by the Government of India to regulate the output of air pollutants from compression ignition engines and spark-ignition engines equipment, including motor vehicles. The standards and the timeline for implementation are set by the Central Pollution Control Board under the Ministry of Environment, Forest and Climate Change.

Source: Wikipedia — Bharat stage emission standards (CC BY-SA 4.0)