M.C.Mehta vs Union Of India & Ors

The Supreme Court ruled that the sale and registration of vehicles that do not meet the Bharat Stage-IV (BS-IV) emission standards as of April 1, 2017, is prohibited due to the significant health hazards posed by air pollution. The Court emphasized that manufacturers had ample time to transition to BS-IV compliant vehicles and that public health takes precedence over commercial interests. Consequently, the Court upheld the prohibition on the sale and registration of BS-III compliant vehicles post the deadline, prioritizing environmental and public health concerns.