• The Supreme Court (Bench headed by CJI Surya Kant) directed the Delhi government and other authorities to submit implementation plans for long-term air pollution measures recommended by the Commission for Air Quality Management (CAQM) [S1][S2].
• Vehicular emissions flagged as the foremost pollution source in Delhi-NCR; measures include phasing out polluting vehicles, EV policy revision, and PUC (Pollution Under Control) regime reform [S1].
• Tests aspirants on environmental governance institutions, Centre-State/UT coordination, and judicial activism in environmental federalism — a recurring GS-II/GS-III theme.
• Directly linked to CAQM Act, 2021, one of the more frequently tested environmental-law bodies replacing the earlier EPCA.

2. Why in the News

• On Wednesday (21 January 2026), the SC directed Delhi and other authorities to submit action plans implementing CAQM's long-term recommendations [S1].
• Additional Solicitor General Aishwarya Bhati, appearing for CAQM, outlined measures: phasing out polluting vehicles, fortifying PUC regime, augmenting rail/metro transport, revised EV policy [S1].
• A meta-analysis of studies (2015–2025) cited before the Court attributed Delhi's PM2.5 to a mix of primary emissions and secondary particulate formation from sources within the NCR [S1].
• Court reportedly directed stakeholders to submit implementation plans within four weeks and indicated it would not entertain objections to CAQM's recommended measures [S2].

3. Background & Evolution

• CAQM established in 2021 under the Commission for Air Quality Management in National Capital Region and Adjoining Areas Act, 2021, replacing the earlier Environment Pollution (Prevention and Control) Authority (EPCA) [S3].
• CAQM issued a comprehensive policy to curb air pollution in NCR in July 2022, constituting an expert group with sector-wise action plans [S3].
• Operates the Graded Response Action Plan (GRAP), invoked in stages (I–IV) based on AQI deterioration; Stage-IV (the most stringent) has been invoked in past years during severe smog episodes [S3].
• 2024 recorded 209 days with AQI in the "Good–Moderate" category (below 200), cited by CAQM as evidence of improvement [S3].
• The current SC directive builds on a long line of judicial interventions on Delhi-NCR air quality dating back to EPCA-era orders and earlier SC monitoring of stubble burning, firecracker bans, and GRAP compliance.

4. Core Static Facts

Item	Detail
Body	Commission for Air Quality Management (CAQM) in NCR and Adjoining Areas
Established	2021, via CAQM Act, 2021
Predecessor	EPCA (Environment Pollution Prevention and Control Authority)
Nodal Ministry	Ministry of Environment, Forest and Climate Change (MoEFCC)
Jurisdiction	Delhi + NCR districts of Haryana, UP, Rajasthan
Key mechanism	Graded Response Action Plan (GRAP), Stage I–IV
Bench in current case	Headed by CJI Surya Kant [S1]
Counsel for CAQM	Additional Solicitor General Aishwarya Bhati [S1]
Key recommended measures	Phase-out of polluting vehicles, PUC regime reform, EV policy revision, rail/metro augmentation, multi-modal transport hubs, RRTS last-mile connectivity, real-time passenger info systems, vehicle-scrapping incentives, EV charging infra expansion [S1]
Pollution source study cited	Meta-analysis of 2015–2025 studies on PM2.5 sources in Delhi [S1]

5. Multi-Dimensional Analysis

Environmental

• Vehicular emissions identified as the foremost pollution source, alongside secondary particulate formation (photochemical reactions of precursor gases) within NCR [S1].
• Long-term measures target structural transport-sector reform rather than seasonal firefighting (unlike stubble-burning bans, firecracker restrictions).

Legal/Constitutional

• SC exercising continuing mandamus jurisdiction over environmental governance, a pattern from M.C. Mehta v. Union of India line of cases.
• Court signaled it will not entertain objections to CAQM's recommendations, effectively making them binding directions — raises questions on separation of powers between judiciary and executive policy-making [S2].

Administrative/Governance

• Highlights Centre-Delhi-NCR states coordination challenges; CAQM was created precisely to overcome inter-state/UT coordination failures of the EPCA era.
• Concerns flagged that "long-term" goals remain continuous processes without time-bound targets, undermining accountability [S2].

Scientific/Technological

• Reliance on meta-analysis of a decade of PM2.5 source-apportionment studies (2015–2025) to attribute pollution causes — reflects growing role of data-driven policy inputs in judicial proceedings [S1].

6. Recent Developments (last 12-18 months)

• 21 January 2026: SC directs Delhi govt and other authorities to submit implementation plans for CAQM's long-term recommendations; ASG Aishwarya Bhati presents measures on CAQM's behalf [S1].
• SC reportedly set a four-week deadline for stakeholders to submit implementation plans [S2].
• CJI instructed the Ministry of Environment/Power to present a proposal for relocating coal-based industries from Delhi-NCR, with alternative fuel source options [S2].
• Ongoing monitoring: Supreme Court Observer and Down To Earth report the Court continuing to review CAQM's "scientific roadmap," noting persistent implementation gaps [S2].

7. Prelims Hooks

• CAQM was constituted under the Commission for Air Quality Management in NCR and Adjoining Areas Act, 2021, replacing EPCA.
• CAQM's jurisdiction covers Delhi and adjoining NCR districts of Haryana, Uttar Pradesh, and Rajasthan.
• The Graded Response Action Plan (GRAP) has four stages, escalating with AQI deterioration; Stage IV is the most stringent.
• In the January 2026 SC hearing, the Bench was headed by CJI Surya Kant.
• Aishwarya Bhati, Additional Solicitor General, represented CAQM before the Court.
• CAQM's recommended long-term measures include phasing out polluting vehicles, PUC regime reform, and a revised EV policy.
• The pollution source analysis cited covered PM2.5 studies from 2015 to 2025.
• CAQM's nodal ministry is the Ministry of Environment, Forest and Climate Change (MoEFCC).
• 2024 recorded 209 days of "Good–Moderate" AQI (below 200) in Delhi, per CAQM data.
• CAQM's mechanism includes Regional Rapid Transit System (RRTS) integration for last-mile connectivity.
• Vehicular emission is identified as the single largest contributing source of Delhi-NCR air pollution per the case proceedings.

8. Mains Relevance

• GS-II: Governance — Centre-State relations, statutory bodies, judiciary's role in policy implementation (continuing mandamus).
• GS-III: Environment — pollution, conservation, environmental impact assessment.
• Possible question stems: 1. "Discuss the institutional evolution from EPCA to CAQM in tackling Delhi-NCR's air pollution. How effective has this transition been?" (GS-III) 2. "Critically examine the Supreme Court's role in enforcing environmental policy through continuing mandamus, with reference to recent directions on Delhi's air pollution." (GS-II) 3. "Vehicular emissions remain the largest contributor to Delhi's air pollution despite years of intervention. Suggest a comprehensive transport-sector reform strategy." (GS-III)

9. Related Topics to Study Next

• Graded Response Action Plan (GRAP) — the operational escalation mechanism CAQM enforces.
• EPCA vs CAQM — institutional comparison, a classic prelims trap.
• M.C. Mehta v. Union of India cases — foundational SC environmental jurisprudence and continuing mandamus.
• National Clean Air Programme (NCAP) — MoEFCC's broader pan-India air quality initiative.
• Stubble burning and crop residue management — seasonal contributor to NCR pollution, tied to Punjab/Haryana agri-policy.
• Electric Vehicle (EV) policy / FAME scheme — links to the EV-transition measures cited in this case.
• Bharat Stage (BS) emission norms — vehicular pollution control standard relevant to PUC regime discussion.
• Doctrine of Continuing Mandamus — judicial review concept underlying SC's sustained monitoring role.

10. Common Errors / Trap Areas

• Confusing CAQM with EPCA — CAQM is a statutory body (2021 Act), EPCA was a non-statutory authority it replaced.
• Assuming CAQM covers all of India — it is specific to NCR and adjoining areas, not a national body (that's NCAP's domain).
• Misattributing nodal ministry — CAQM functions under MoEFCC, not the Ministry of Urban Development or Ministry of Road Transport, despite its transport-heavy recommendations.
• Conflating GRAP stages with CAQM's long-term structural measures — GRAP is short-term/seasonal emergency response; the SC's January 2026 directive concerns long-term structural reform.
• Assuming the SC order applies only to Delhi — it addresses "Delhi and other authorities," implying NCR states too.

11. Sources

• [S1] SC asks Centre, Delhi to submit action plan on curbing air pollution — The Hindu — https://www.thehindu.com/todays-paper/2026-01-22/th_international/articleG7FFFK0PJ-13196474.ece — (tier: 4)
• [S2] SC orders Delhi-NCR to implement CAQM's long-term air pollution plan — Business Standard — https://www.business-standard.com/india-news/supreme-court-sc-delhi-ncr-caqm-air-pollution-air-quality-crisis-aqi-126012100960_1.html — (tier: 4)
• [S3] Commission for Air Quality Management — PIB — https://www.pib.gov.in/PressReleasePage.aspx?PRID=1671452 — (tier: 1)