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Vehicular Exhaust
| Emission norms for passenger cars | ||
| Norms | CO( g/km) | HC+ NOx(g/km) |
| 1991Norms | 14.3-27.1 | 2.0(Only HC) |
| 1996 Norms | 8.68-12.40 | 3.00-4.36 |
| 1998Norms | 4.34-6.20 | 1.50-2.18 |
| India stage 2000 norms | 2.72 | 0.97 |
| Bharat stage-II | 2.2 | 0.5 |
| Bharat Stage-III | 2.3 | 0.35(combined) |
| Bharat Stage-IV | 1.0 | 0.18(combined) |
Emission norms for Heavy Disel vehicles
| Norms | CO(g/kmhr) | HC (g/kmhr) | NOx (g/kmhr) | PM(g/kwhr) |
| 1991Norms | 14 | 3.5 | 18 | - |
| 1996 Norms | 11.2 | 2.4 | 14.4 | - |
| India stage 2000 norms | 4.5 | 1.1 | 8.0 | 0.36 |
| Bharat stage-II | 4.0 | 1.1 | 7.0 | 0.15 |
| Bharat Stage-III | 2.1 | 1.6 | 5.0 | 0.10 |
| Bharat Stage-IV | 1.5 | 0.96 | 3.5 | 0.02 |
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