MC Mehta v. Union of India (Delhi vehicular pollution, 1985 onwards)
Lawyer M.C. Mehta filed a series of public-interest petitions on Delhi's air. The Supreme Court ordered Delhi buses, taxis and autorickshaws onto compressed natural gas, set deadlines, and held the city's transport department accountable when it missed them.
Delhi became the first major city in the world with a CNG public transport fleet by 2003.
The court's habit of running infrastructure rollouts from the bench became standard for environmental and welfare cases.
The trauma-care directions read like an MC Mehta order. Hard deadlines, technical specifications, monthly hearings.
