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India’s BS6 Emission Testing Gets Major Update In 2026 — WLTP Norms Explained
India's BS6 emission testing framework is set to adopt a new methodology starting April 2026. The shift to the WLTP (Worldwide Harmonized Light Vehicle Test Procedure) aims to deliver a more realistic assessment of vehicle emissions and fuel efficiency compared to earlier testing methods.
The revised testing method will apply to M1 and M2 category vehicles, including passenger cars and certain commercial vehicles weighing under five tonnes. The Government of India notified these changes through the Ministry of Road Transport and Highways on 28 April 2025.
New BS6 Emission Testing Methods
Previously, emission testing in India relied primarily on laboratory-based MIDC (Modified Indian Driving Cycle), which operates under fixed conditions. However, the WLTP cycle, already used in Europe, is considered to deliver results closer to real-world driving conditions and therefore provides more accurate emissions data.
With this transition, all new vehicles manufactured starting from April 1, 2027, are expected to comply with WLTP-based emission testing norms. Alongside the new CAFE 3 (Corporate Average Fuel Efficiency) regulations, the new testing method will further tighten emission standards.
CAFE 3 Norms & Regulations
Earlier drafts of the CAFE 3 regulations included weight and size-based considerations aimed at improving fuel efficiency and reducing CO₂ emissions. However, these proposals faced resistance from several manufacturers, including Tata Motors and Mahindra, which resulted in revisions to the framework.
It was centered around the small-car segment, where Maruti Suzuki holds a dominant market share. Initially, it was proposed that lighter vehicles result in more fuel efficiency and lower CO2 emissions.
Under the CAFE 3 norms, manufacturers may also earn credits for selling electric and hybrid vehicles, encouraging a gradual shift toward cleaner mobility solutions. These regulations are expected to come into force from April 2027 and remain applicable for a five-year cycle.
As emission standards continue to tighten, automakers will need to reassess product strategies, technology investments, and powertrain options to remain competitive while meeting regulatory requirements.
Overall, these regulatory changes aim to reduce vehicular emissions, improve fuel efficiency, and accelerate the adoption of electric and hybrid vehicles, particularly as transportation remains a significant contributor to India's energy consumption and emissions.
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