What does BS mean?

Bharat Stage (BS) norms are emission standards instituted by the Government of India (GoI) to regulate the output of air pollutants from internal combustion engines. These standards are quite similar to European Union’s Euro norms. The difference are the values of various parameters. Euro norms are harder than BS ones. Typically, the higher the stage, the more stringent the norms.

Examples:
Bharat Stage II (BS II), similar to Euro 2
Bharat Stage III (BS III), similar to Euro 3
Bharat Stage IV (BS IV), similar to Euro 4

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