| BS Standard | Carbon Monoxide (g/km) | Hydrocarbons + Nitrogen Oxides (g/km) | Respirable Suspended Particulate Matter (g/km) | Sulphur Content in Fuel (PPM) | Key Changes |
|---|---|---|---|---|---|
| BS1 (India 2000) | 2.72 | 0.97 | 0.14 | N/A | - Retuning of carburettor, secondary air intake system, exhaust gas recirculation system - Increase in catalyser capacity - Addition of trimetal coating to the system |
| BS2 | 2.2 | 0.50 | 0.08 | 500 | - Replacement of carburettor with Multi-point Fuel Injection (MPFI) system - Reduction in emissions |
| BS3 | Petrol: 2.3 Diesel: 0.64 (CO) 0.50 (NOx) 0.35 (HC + NOx) |
Petrol: 0.05 Diesel: 0.56 (HC + NOx) |
Petrol: N/A Diesel: 0.05 |
Petrol: N/A Diesel: 100 |
- Introduction of more stringent norms - Installation of catalytic converter |
| BS4 | Petrol: 1.0 Diesel: 0.50 (CO) 0.25 (NOx) 0.18 (HC + NOx) |
Petrol: 0.025 Diesel: 0.30 (HC + NOx) |
Petrol: N/A Diesel: 0.025 |
Petrol: N/A Diesel: 50 |
- Mandatory from April 2017 - Addition of bigger catalytic converters - Tweaking of Engine Control Unit (ECU) - Modification of air intakes and exhaust systems |
| BS6 | Petrol: 1.0 Diesel: 0.50 (CO) 0.06 (NOx) 0.16 (HC + NOx) |
Petrol: 0.05 Diesel: 0.17 (HC + NOx) |
Petrol: N/A Diesel: 0.05 |
Petrol: N/A Diesel: 10 |
- Implementation from April 2020 - Further reduction in emissions - Stringent regulations for tailpipe discharge |
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