India is preparing a new set of vehicle‑emission rules called BS‑VII. The draft, issued by the MoRTH, expands the focus from exhaust smoke to brake‑dust, tyre‑wear and electric‑vehicle (EV) battery durability. The rules will roll out gradually, starting with passenger cars on 1 April 2029 and ending with heavy trucks by 1 April 2031 (with later phases up to 2035).
Key Developments
- On‑road testing with portable equipment (a form of RDE) will become mandatory for type‑approval from April 2030.
- Particle‑number limits will be tightened: measurement threshold drops from 23 nm to 10 nm, pulling in smaller particles.
- Brake‑particle limits of 3 mg/km for EVs and 7 mg/km for other cars start April 2031, moving to a uniform 3 mg/km across all powertrains by April 2035.
- Tyre‑abrasion limits will be notified from April 2031; exact numbers will follow later.
- EVs and plug‑in hybrids must meet battery‑energy benchmarks – retain ≥75 % capacity after 5 years/100,000 km and ≥67 % after 8 years/160,000 km.
- An Environmental Vehicle Passport will be mandatory, providing real‑time emission and efficiency data.
Important Facts
For passenger cars, the draft keeps existing limits for carbon monoxide (1,000 mg/km for petrol, 500 mg/km for diesel) and nitrogen oxides (60 mg/km petrol, 80 mg/km diesel). Particulate matter (PM) is capped at 4.5 mg/km for both fuel types. Vehicles must also have an OBD that flags emissions exceeding 2.5 times the limit; data will be readable through the diagnostic port from April 2032.
Light commercial vehicles follow a year later (April 2030) with weight‑based limits and brake‑particle rules from April 2032. Buses and heavy trucks join in April 2031, with limits expressed per unit of engine energy and additional gases (ammonia, methane, nitrous oxide). Their durability checks extend up to 875,000 km or 15 years.
Exam Relevance
Understanding BS‑VII is crucial for GS III (Environment & Climate) and GS II (Infrastructure). The policy illustrates how India aligns with global emission‑control trends, integrates sustainability (brake/tyre dust, EV battery life), and uses technology‑driven compliance (RDE, OBD, digital passports). Questions may ask about the impact on automotive industry, consumer costs, or India’s commitment to air‑quality improvement.
Way Forward
Stakeholders have asked for a later start (2029‑2035) citing technology and cost concerns. The Ministry will likely fine‑tune limits and notification dates before finalising the rules. Aspirants should monitor the final Gazette notification, the detailed numerical limits for brake‑dust and tyre‑wear, and the implementation of the Environmental Vehicle Passport, as these will shape future regulatory and market dynamics.