India tightens vehicle emission testing with digitally signed PUC certificates

India's automotive sector is bracing for more rigorous pollution control standards as regulators prepare to overhaul the Pollution Under Control (PUC) certification system. The proposed amendments to the Automotive Industry Standard (AIS)-137 (Part 8), effective October 2026, will mandate digitally signed emission test results backed by enhanced hardware security protocols.

The move represents a significant step toward preventing certificate fraud and ensuring genuine compliance with environmental standards across the country's vehicle fleet. Currently, PUC certificates—mandatory proof that a vehicle meets emission norms—have been vulnerable to falsification, undermining the integrity of India's air quality management efforts.

The new framework will require testing centres to implement hardware-based security mechanisms to authenticate emission results. This technological upgrade is expected to create a tamper-proof digital trail for every vehicle tested, linking certificates directly to authenticated test data through cryptographic signatures.

Industry analysts say the implementation will initially strain testing infrastructure, as facilities upgrade their equipment and staff undergo training on new protocols. However, they acknowledge the measures are essential to achieve India's environmental goals and improve urban air quality in major metropolitan areas.

The regulation applies to all vehicle categories subject to periodic PUC testing. Vehicle owners, testing centres, and state transport authorities will need to adapt to the new digital framework ahead of the October 2026 deadline.