Supreme Court Probes "Severe Situation" of Defunct Delhi Air Monitors, Questions GRAP Efficacy

NEW DELHI – The Supreme Court of India has directed central and state environmental agencies to submit a comprehensive report on the operational status of air quality monitoring stations in Delhi, following startling revelations that a majority of them were non-functional during the critical post-Diwali period. The Court’s intervention casts a significant legal shadow over the efficacy and data-driven foundation of the Graded Response Action Plan (GRAP), the capital's primary mechanism for combating severe air pollution.

A bench comprising Chief Justice of India B.R. Gavai and Justice K. Vinod Chandran, presiding over the long-standing environmental litigation in MC Mehta v. Union of India (WP (C) 13029/1985) , expressed grave concern over the issue. The Court's order mandates the Commission for Air Quality Management (CAQM) and the Central Pollution Control Board (CPCB) to detail the steps being taken to prevent the air quality from deteriorating to "severe" levels and to clarify the status of the monitoring infrastructure.

The hearing was galvanized by submissions from the amicus curiae in the case, Senior Advocate Aparajita Singh, who brought recent media reports to the bench's attention. She highlighted the alarming discrepancy in the data collection network, a cornerstone of environmental governance in the National Capital Region (NCR).

"There are newspapers after newspapers saying monitoring stations are non-functional," Singh argued before the bench. "If the monitoring stations are not even functioning, we don't even know when to implement GRAP. That is the severe situation, my lords."

She presented a stark statistic, claiming that on Diwali, a day of significant air quality concern, "out of 37 [monitoring stations], only 9 were functioning continuously." This revelation immediately raised fundamental questions about the legal and scientific basis for the implementation of anti-pollution measures.

The Legal Conundrum: Data Integrity and GRAP Implementation

The Graded Response Action Plan (GRAP) is a judicially-approved, step-by-step emergency response framework that is triggered based on specific Air Quality Index (AQI) thresholds. Its measures, which range from banning construction activities to implementing traffic restrictions, are contingent upon real-time, accurate data from a network of monitoring stations.

The amicus curiae's submission underscored a critical flaw in this legal framework: without reliable data, the entire GRAP system is rendered arbitrary and ineffective. "If that’s the case, how will we know when to implement GRAP?" Singh pointedly asked, articulating the core legal challenge now before the Court. The absence of data not only delays the implementation of emergency measures but also potentially exposes the public to hazardous air quality without the mandated legal protections being activated.

This situation presents a classic case of regulatory failure, where the infrastructure designed to enforce a legal mandate is itself compromised. Legal experts suggest this could open the door to further litigation challenging the actions—or inaction—of regulatory bodies like the CPCB and CAQM, who are statutorily obligated to monitor and manage air quality.

Agency Accountability and Pre-emptive Action

The Supreme Court's line of questioning also focused on the principle of pre-emptive action, a directive it had previously issued. Amicus Curiae Singh reminded the Court of its earlier orders, stating, "it was said that you will not wait for the pollution to turn severe, you will pre-empt, so let them just file a report."

In response, the Court explicitly directed the CAQM to file an affidavit detailing its proactive strategy. The order reads: "The CAQM is required to place on record an affidavit as to what steps are proposed to be taken so as to prevent the pollution turning to be severe."

During the proceedings, counsel for the CAQM attempted to shift the responsibility for reporting on monitoring stations to the CPCB, stating that the CPCB holds the relevant data. This prompted a sharp rebuke from the amicus curiae, who questioned, "Why is the CAQM shirking from filing a report?" Ultimately, Additional Solicitor General Aishwarya Bhatti, appearing for the state agencies, assured the Court that the required report would be filed. This exchange highlights the inter-agency coordination challenges that often plague the implementation of environmental law.

Context: The Firecracker Ban and Judicial Balancing

The hearing took place against the backdrop of the Court’s recent, carefully calibrated order from October 14, 2025, which temporarily relaxed the absolute ban on firecrackers. The Court, in that order, had permitted the use of "green crackers" for limited hours on Diwali, describing the relaxation as a "test case basis."

That order included a slew of stringent directions aimed at controlling the sale, use, and monitoring of firecrackers, including:

- Limited Sale Period: Permitting the sale of NEERI-certified green crackers only from October 18 to October 20, 2025.

- Designated Locations: Restricting sales to locations identified by District Collectors and Police Commissioners.

- Enforcement Patrols: Mandating patrolling teams to verify QR codes on permitted products and penalize violators.

- Restricted Timings: Confining the use of firecrackers to between 6:00 AM - 7:00 AM and 8:00 PM - 10:00 PM on the day before and on Diwali.

- Comprehensive Monitoring: A specific direction (Clause 'L') tasked the CPCB and State Pollution Control Boards with monitoring the AQI from October 14 to October 25, 2025, and filing a detailed report.

The failure of the monitoring stations, as alleged before the court, directly undermines the Court's ability to assess the impact of this "test case" relaxation, thereby crippling the data-driven judicial review process it had established.

Implications for Environmental Jurisprudence

This development in the MC Mehta case marks a pivotal moment in India's environmental jurisprudence. For decades, this PIL has served as the primary vehicle for the Supreme Court's "continuous mandamus," allowing it to oversee complex environmental challenges. The current issue shifts the focus from policymaking to the fundamental mechanics of implementation and enforcement.

The Court's demand for accountability regarding monitoring infrastructure signals a move towards scrutinizing the operational capacity of the very agencies tasked with executing its orders. For legal practitioners in the environmental sector, this underscores the growing importance of grounding legal arguments in verifiable scientific data and, conversely, challenging regulatory actions that lack a sound evidentiary basis. The outcome of this inquiry could set a new precedent for the level of infrastructural and operational accountability required of environmental agencies in India.