The Supreme Court has ordered Delhi and three adjacent states to submit action plans on vehicular pollution within two weeks.

The order requires authorities to explain how non-compliant vehicles are identified, regulated and prevented from entering the National Capital Region, and to provide data on inspected vehicles, challanes issued, entry denials and enforcement actions taken.

States must also outline both short-term and long-term measures to curb emissions.

The Court highlighted the need for inter-state collaboration on vehicle management and stricter adherence to emission standards, and scheduled a review of the matter on November 23.

In a related development, Delhi's air quality index (AQI) is already reaching 389 to 391, with several areas moving toward "severe" levels. The Court stressed the impact of poor air quality on daily-wage earners and urged measures to educate farmers about managing crop residue without resorting to farm fires.