Introduction:
The Supreme Court of India, while continuing to monitor the long-running air pollution matter arising out of MC Mehta v. Union of India & Ors., modified its earlier order dated August 12, 2025, which had barred coercive action against diesel vehicles older than 10 years and petrol vehicles older than 15 years in the National Capital Region (NCR). The matter was heard by a Bench comprising Chief Justice of India Surya Kant, Justice Joymalya Bagchi, and Justice Vipul Pancholi.
The modification came on a plea moved by the Government of the National Capital Territory of Delhi, represented by Additional Solicitor General Aishwarya Bhati, seeking permission to take action against older vehicles that fall below the Bharat Stage IV (BS-IV) emission norms. The application was supported by Senior Advocate Aparajita Singh, who was assisting the Court as amicus curiae in the air pollution case.
The issue before the Court arose in the backdrop of a severe air quality crisis in Delhi and NCR, persistent public debate over end-of-life vehicles (ELVs), and conflicting administrative directions regarding fuel supply restrictions. While the August 12 order had provided interim relief to owners of old vehicles, the Delhi Government argued that such blanket protection was undermining pollution control measures and diluting the intent of earlier binding directions issued by the National Green Tribunal (NGT) and affirmed by the Supreme Court itself.
The December 17 clarification thus sought to strike a balance between individual hardship faced by vehicle owners and the larger constitutional obligation of the State to protect public health and the environment.
Arguments on Behalf of the Delhi Government:
The Delhi Government, through Additional Solicitor General Aishwarya Bhati, urged the Court to revisit and suitably modify its August 12, 2025 order. It was submitted that the earlier protection against coercive action was being interpreted too broadly and was preventing authorities from acting against vehicles that are demonstrably high polluters.
The ASG argued that older vehicles inherently have poor emission performance, particularly those conforming to BS-III or earlier standards, and that such vehicles significantly contribute to deteriorating air quality levels in Delhi NCR. She emphasised that the city was facing an acute air pollution crisis, with public health emergencies becoming an annual phenomenon, and that regulatory paralysis regarding vehicular pollution could not be sustained.
It was contended that the August 12 order was never intended to shield all old vehicles regardless of their emission standards. Instead, the Delhi Government submitted that a distinction must be drawn between vehicles merely old in age and vehicles old in emission technology. According to the Government, vehicles meeting BS-IV or newer standards, though older in age, are substantially cleaner than pre-BS-IV vehicles and should be treated differently.
The ASG further relied on the history of judicial and regulatory interventions, pointing out that the National Green Tribunal in 2015 had categorically prohibited diesel vehicles older than 10 years and petrol vehicles older than 15 years from plying in Delhi NCR, and that this direction had been upheld by the Supreme Court in 2018. The Government argued that allowing BS-III and older vehicles to continue operating would effectively nullify these binding precedents.
It was also highlighted that the Delhi Government had framed the Guidelines for Handling End-of-Life Vehicles in Public Places of Delhi, 2024, pursuant to statutory obligations under environmental and motor vehicle laws. The subsequent decision to deny fuel to end-of-life vehicles from July 1, 2025, though temporarily put on hold due to public backlash, demonstrated the Government’s policy intent to enforce pollution control measures. According to the State, judicial clarification was necessary to remove ambiguity and restore effective enforcement.
In essence, the Delhi Government pleaded that public interest, environmental protection, and the right to clean air under Article 21 must prevail over individual inconvenience caused to owners of older, highly polluting vehicles.
Submissions of the Amicus Curiae:
Senior Advocate Aparajita Singh, appearing as amicus curiae in the MC Mehta air pollution matter, supported the Delhi Government’s plea for modification. She placed the issue in its proper technical and regulatory context, explaining that BS-IV emission norms were introduced around 2010, and that BS-III vehicles pre-date this period.
The amicus submitted that BS-III vehicles, by design, emit significantly higher levels of particulate matter and nitrogen oxides when compared to BS-IV and later models. Allowing such vehicles to continue plying merely because of interim judicial protection would be inconsistent with India’s progressive tightening of emission standards and its international environmental commitments.
She also cautioned the Court against permitting a situation where age-based exemptions overshadow emission-based regulation. According to her, the focus must remain on actual pollution potential, not just the year of registration. The amicus underscored that judicial orders in environmental matters must evolve with scientific data and ground realities, especially in a city like Delhi where vehicular pollution is a major contributor to hazardous air quality.
Implicit Position of Vehicle Owners and Public Concerns:
Although not directly represented in the arguments recorded in the order, the background to the case reflects concerns raised by vehicle owners and sections of the public. Many owners of older vehicles argued that their vehicles were roadworthy, well-maintained, and compliant with pollution under control (PUC) norms. They also highlighted the financial burden of replacing vehicles solely on the basis of age.
These concerns had earlier led to widespread public backlash against the July 1, 2025 fuel supply ban, prompting the Delhi Government to put the decision on hold and seek judicial guidance. The August 12 order was seen as a temporary relief to such owners, and the present modification was therefore scrutinised in light of fairness, proportionality, and administrative feasibility.
Court’s Judgment:
After hearing the submissions, the Supreme Court clarified the scope and intent of its August 12, 2025 order. The Bench observed that the earlier direction was being misconstrued as granting blanket immunity to all old vehicles, irrespective of their emission standards. Such an interpretation, the Court implied, would be contrary to established environmental jurisprudence and the very objective of pollution control.
The Court dictated that the August 12 order stood modified to the limited extent that no coercive steps shall be taken against owners of vehicles which are BS-IV and newer, solely on the ground that they are more than 10 years old in the case of diesel vehicles or more than 15 years old in the case of petrol vehicles. By necessary implication, the Court clarified that vehicles below BS-IV standards, including BS-III and earlier models, would not enjoy such protection, even if they fell within the age-based categories earlier discussed.
The Bench thus restored the regulatory authority of the State to act against high-polluting, older-technology vehicles, while simultaneously safeguarding owners of relatively cleaner BS-IV and newer vehicles from arbitrary coercive action based only on age. The Court’s reasoning reflected a calibrated approach, harmonising past NGT and Supreme Court rulings with present-day environmental exigencies.
The judgment reaffirmed that environmental protection and public health are integral components of the right to life under Article 21, and that courts cannot remain oblivious to worsening air quality trends. At the same time, the Court demonstrated sensitivity to legitimate expectations of vehicle owners who had invested in cleaner technology and complied with evolving emission norms.
Importantly, the Court did not disturb the broader framework laid down by the NGT in 2015, upheld in 2018, or the policy initiatives undertaken by the Delhi Government in 2024 and 2025. Instead, it clarified the operational space within which such measures could be implemented, ensuring legal certainty and preventing misuse or overreach.