In the case of M.C. Mehta v. Union of India and others (2026), the Supreme Court of India formally disposed of one of its longest-standing matters—Writ Petition (Civil) No. 4677/1985—to restructure its extensive proceedings into specialized and manageable categories.
Case Background and Evolution
Filed in 1985, this petition is the second-oldest case pending before the Court. It was originally instituted to address the proliferation of unauthorized, heavy, and noxious industries in Delhi that were causing significant environmental degradation. Over four decades, the case evolved into a “continuing mandamus” with a drastically expanded scope, covering:
- Violations of Delhi’s Master Plans.
- Misuse of residential property for commercial or industrial purposes.
- Reduction of green cover and groundwater depletion in the National Capital Territory (NCT) of Delhi.
- Mining activities in the NCT and the Aravalli region.
The Need for Restructuring
The Court noted that while the petition began with a narrow focus, it grew into a protector of general citizenship rights, resulting in 433 pending Interlocutory Applications (IAs) as of the judgment date. The Court found that managing such a diverse range of contemporary issues under a single 40-year-old case number posed “significant administrative difficulties” and hindered efficient adjudication.
Key Directions and Disposal
To bring “order and efficiency” to the litigation, the Court issued the following directions:
- Formal Disposal: The original Writ Petition (No. 4677/1985) was formally disposed of.
- Creation of New Suo Moto Petitions: The Registry was directed to register two new, focused Suo Moto Writ Petitions:
- “Regulation of Hazardous Industries in the National Capital Region”.
- “Protection of Water Resources and Prevention of Water Pollution in the National Capital Region”.
- Transfer to High Court of Delhi: Issues relating to land-use, illegal construction, encroachment on public land, and challenges to the Delhi Master Plan 2021 were transferred to the High Court of Delhi. The High Court will hear these under its Article 226 jurisdiction.
- Transfer of Other Environmental Issues:
- Applications regarding mining in the Aravalli Hills were transferred to a dedicated existing suo moto case (WP(C) No. 10/2025).
- Applications regarding tree cutting, Ridge protection, and air pollution in Delhi-NCR were transferred to new suo moto proceedings registered under another related M.C. Mehta case (WP(C) No. 13029/1985).
- Preserving Past Orders: The Court clarified that the formal disposal of the 1985 petition does not invalidate previous orders; all past directions remain final and operative.
Timeline for Pending Applications
Advocates-on-Record (AORs) must inform the Registry by May 15, 2026, whether their pending applications have become infructuous. If an application remains active, the AOR must submit a note explaining why it requires further consideration and has not been covered by existing court orders.
2026 INSC 382
M.C. Mehta V. Union of India And Others (D.O.J. 11.03.2026)




