About Bharat Stage (BS) Emission Norms
- These are legally enforced regulatory standards instituted by the Government of India to control the output of air pollutants from internal combustion engine (ICE) and spark-ignition vehicles.
Governing Framework:
- Broadly framed by the Ministry of Environment, Forest and Climate Change (MoEFCC), notified via the Ministry of Road Transport and Highways (MoRTH) under the Central Motor Vehicles Rules (CMVR), 1989, and enforced through the Central Pollution Control Board (CPCB).
- Global Benchmark: Adapted and aligned with European (Euro) emission standards.
- Core Regulated Pollutants: Carbon Monoxide (CO), Hydrocarbons (HC), Nitrogen Oxides (NOx), and Particulate Matter (PM2.5/PM10).
- Foundational Milestone: The R.A. Mashelkar Committee (2002) laid down the roadmap for phased, nationwide implementation of Euro-equivalent standards.
Chronological Evolution
- 2000 (BS-I / India 2000): Mandated following Supreme Court directives (1999) based on Euro-I norms.
- 2005 (BS-II) & 2010 (BS-III): Phased rollout across major metropolitan centres before nationwide expansion.
- 2017 (BS-IV): Enforced nationwide, introducing onboard diagnostics (OBD-I) and setting fuel sulphur limits at 50 ppm (mg/kg).
- 2020 (BS-VI Leapfrog): India skipped BS-V entirely to directly transition from BS-IV to BS-VI, sharply lowering permissible emission thresholds and slashing fuel sulphur content to 10 ppm (mg/kg).
- 2023 (BS-VI Phase-II): Introduced Real Driving Emissions (RDE) testing alongside standard laboratory-based cycles, requiring mandatory On-Board Diagnostics (OBD-II) to monitor real-time tailpipe emissions.
- Upcoming BS-VII: Planned alignment with Euro-7 standards to establish stricter limits across operational temperatures, brake wear particles, and secondary greenhouse gases.
| This concept has been discussed elaborately in the following article: PARIVARTAN Scheme: Cleaner Commercial Transport in Delhi-NCR |