BS7 Emission Norms Proposed for April 2029: What Can Change for Cars in India?
India is set to implement Bharat Stage VII (BS7) emission norms for passenger cars on April 1, 2029, targeting reduced vehicle pollution by tightening exhaust limits and incorporating real-world emission testing.
BS7 Emission Norms Proposed for April 2029: What Can Change for Cars in India?
April 1, 2029India is preparing for its next major update to vehicle emission regulations, with the government proposing to introduce Bharat Stage VII (BS7) norms for passenger cars from April 1, 2029. The proposed standards aim to reduce vehicle pollution by tightening exhaust emission limits and expanding checks beyond laboratory testing to real-world driving conditions.
Key Highlights:
- India proposes to introduce BS7 emission norms for passenger cars from April 1, 2029.
- The new rules will tighten exhaust emission limits and introduce real-world driving tests.
- Brake particle emissions and tyre abrasion will come under regulation from April 2031.
- Electric vehicles will face battery durability requirements, while buyers may get an Environmental Vehicle Passport.
The Ministry of Road Transport and Highways (MoRTH) has issued a draft notification proposing amendments to the Central Motor Vehicles Rules, 1989. The ministry has invited public comments for 30 days before finalising the amendments.
If implemented as proposed, the new regulations will be introduced in three phases, beginning in April 2029, followed by additional requirements in April 2031 and April 2035. The framework will cover conventional petrol and diesel cars, alternative-fuel vehicles, hybrids and electric vehicles under applicable provisions.
When Will BS7 Emission Norms Come Into Effect in India?
The proposed BS7 standards will primarily apply to category M1 vehicles, which include passenger cars, manufactured from April 1, 2029. India currently follows BS6 emission norms, which came into effect nationwide in April 2020. The proposed BS7 framework will expand emission monitoring, introduce additional pollution controls and set durability requirements for vehicles and their components.
The draft outlines three key implementation stages:
| Timeline | Proposed requirements |
| April 1, 2029 | Exhaust emission limits, real-world emission testing, energy consumption monitoring and battery durability requirements |
| April 1, 2031 | Brake particle emission limits and tyre abrasion requirements |
| April 1, 2035 | Tighter brake particle emission requirements and additional particle-number controls |
Some requirements, including specific tyre abrasion limits and certain battery-related thresholds, are yet to be notified separately.
What Are the Proposed BS7 Emission Limits for Petrol and Diesel Cars?
The first phase of BS7 norms will introduce tighter controls on exhaust emissions from passenger vehicles. The draft specifies limits for carbon monoxide (CO), nitrogen oxides (NOx) and particulate matter.
The proposed limits for M1 vehicles include:
| Pollutant | Petrol-type engines | Diesel engines |
| Carbon monoxide (CO) | 1,000 mg/km | 500 mg/km |
| Nitrogen oxides (NOx) | 60 mg/km | 80 mg/km |
| Particulate matter (PM) | 4.5 mg/km | 4.5 mg/km |
The proposed framework covers several fuel types, including petrol, diesel, CNG, LPG, ethanol-blended fuels, methanol and hydrogen. It also includes flex-fuel and bi-fuel vehicles, along with hybrids and electric vehicles under the relevant provisions.
Apart from exhaust emissions, the rules will address evaporative emissions, fuel consumption and electric energy consumption.
How Will Real-World Emission Testing Change Under BS7?
Under the proposed regulations, manufacturers will have to demonstrate that vehicles comply with emission limits not only in laboratory tests but also during real-world driving. From April 1, 2030, type approval will include on-road emission tests using portable emissions measurement systems. The draft specifies a conformity factor of 1.0 for NOx and particle number.
Vehicles will also need on-board diagnostic and monitoring systems capable of detecting excessive emissions. The proposed rules specify monitoring capable of detecting emissions at levels at least 2.5 times the applicable limit.
In addition, vehicles will be required to monitor fuel consumption and electric energy consumption. Fuel consumption data is proposed to become accessible from April 1, 2030, while monitoring data will be accessible from April 1, 2032, including through over-the-air systems.
These measures are intended to improve the monitoring of vehicle emissions and energy use after vehicles leave the showroom.
What Will BS7 Norms Mean for Electric Vehicles?
The proposed BS7 framework will introduce specific requirements for electric vehicle batteries and non-exhaust emissions. For pure electric vehicles and plug-in hybrids, batteries will have to retain at least 75% of their performance for the first five years or 100,000 km. They will also have to retain at least 67% performance for up to eight years or 160,000 km, whichever comes first.
The draft also proposes limits on particulate emissions generated by braking. These requirements will apply to electric vehicles as well as other powertrain categories. The proposed rules aim to account for pollution sources beyond exhaust pipes, including particles released through braking and tyre wear. This is particularly relevant for electric vehicles, which do not produce tailpipe emissions during operation.
From April 2035, the draft proposes a common brake particle emission limit of 3 mg/km across the covered powertrain technologies. Tyre abrasion requirements for C1 tyres are also scheduled to take effect from April 2031. However, the specific limits will be notified separately.
Will BS7 Norms Affect Vehicle Maintenance and Durability?
The proposed standards will require vehicles to maintain emission compliance for 160,000 km or eight years, followed by an additional lifetime period extending to 200,000 km or 10 years.
Manufacturers will also have to meet the proposed battery durability requirements for electric vehicles and plug-in hybrids.
These provisions could increase the importance of emission-control systems, battery performance and long-term component durability during vehicle development. The final impact on manufacturers and buyers will depend on the notified rules and the compliance measures adopted by individual companies.
What Is an Environmental Vehicle Passport?
The draft proposes an Environmental Vehicle Passport that will provide buyers with information about a vehicle's environmental performance. The passport is expected to include details such as pollutant emissions, fuel consumption and battery state of health. The rules also envisage making relevant information available through an in-vehicle display.
This could give buyers additional information to compare vehicles based on fuel efficiency, emissions and battery condition, particularly as the market shifts towards electrified powertrains.
Will BS7 Norms Introduce New Rules for Ethanol-Blended Fuel?
The draft also includes provisions for vehicles running on different fuel blends. Manufacturers will have to declare and label ethanol compatibility for vehicles compatible with blends containing more than 20% ethanol (E20).
Additionally, petrol-type and diesel vehicles equipped with geofencing technology may be approved under a proposed 'BS-VII-G' classification.
The government has not yet finalised the proposed amendments. The requirements, implementation timelines and certain technical limits may change after the public consultation process.
If the draft is adopted, BS7 will mark another major step in India's vehicle emission regulations, with requirements extending beyond exhaust pollution to real-world monitoring, brake particles, tyre wear and battery durability.
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