Air & Transportation
Motor Vehicle Exhaust Emission Standards-table
| Category | Test Mode | Components | Current Regulation | Notes | ||||
|---|---|---|---|---|---|---|---|---|
| Enforce- ment year | Standard value | |||||||
| Gasoline /LPG motor vehicles | Passenger cars | 4-cycle and 2-cycle | 10·15M (g/km) |
CO | 1975 | 2.70 (2.10) | 2-cycle vehicles are not currently in production. | |
| HC | 1975 | 0.39 (0.25) | ||||||
| NOx | 1978 | 0.48 (0.25) | ||||||
| 11M (g/test) |
CO | 1975 | 85.0 (60.0) | |||||
| HC | 1975 | 9.50 (7.00) | ||||||
| NOx | 1978 | 6.00 (4.40) | ||||||
| Trucks and buses | 4-cycle mini-size motor vehicles | 10·15M (g/km) |
CO | 1998 | 8.42 (6.50) | |||
| HC | 1998 | 0.39 (0.25) | ||||||
| NOx | 1998 | 0.48 (0.25) | ||||||
| 11M (g/test) |
CO | 1998 | 104 ( 76) | |||||
| HC | 1998 | 9.50 (7.00) | ||||||
| NOx | 1998 | 6.00 (4.40) | ||||||
| 2-cycle mini-size motor vehicles | 10·15M (g/km) |
CO | 1975 | 17.0 (13.0) | No longer in production. | |||
| HC | 1975 | 15.0 (12.0) | ||||||
| NOx | 1975 | 0.50 (0.30) | ||||||
| 11M (g/test) |
CO | 1975 | 130 ( 100) | |||||
| HC | 1975 | 70.0 (50.0) | ||||||
| NOx | 1975 | 4.00 (2.50) | ||||||
| Light-duty vehicles (GVW  1.7t) |
10·15M (g/km) |
CO | 1988 | 2.70 (2.10) | ||||
| HC | 1988 | 0.39 (0.25) | ||||||
| NOx | 1988 | 0.48 (0.25) | ||||||
| 11M (g/test) |
CO | 1988 | 85.0 (60.0) | |||||
| HC | 1988 | 9.50 (7.00) | ||||||
| NOx | 1988 | 6.00 (4.40) | ||||||
| Medium-duty vehicles (1.7t  GVW2.5t) |
10·15M (g/km) |
CO | 1998 | 8.42 (6.50) | ||||
| HC | 1998 | 0.39 (0.25) | ||||||
| NOx | 1994 | 0.63 (0.40) | ||||||
| 11M (g/test) |
CO | 1998 | 104 ( 76) | |||||
| HC | 1998 | 9.50 (7.00) | ||||||
| NOx | 1994 | 6.60 (5.00) | ||||||
| Heavy-duty vehicles (2.5t GVW) |
G13M (g/kWh) |
CO | 1998 | 68.0 (51.0) | LPG-fueled 105(76) | |||
| HC | 1998 | 2.29 (1.80) | ||||||
| NOx | 1995 | 5.90 (4.50) | ||||||
| Diesel motor vehicles | Passenger cars | 10·15M (g/km) |
CO | 1986 | 2.70 (2.10) | |||
| HC | 1986 | 0.62 (0.40) | ||||||
| NOx | Small | 1997 | 0.55 (0.40) | |||||
| Medium | 1998 | 0.55 (0.40) | ||||||
| PM | 1997, 1998 |
0.14 (0.08) | Small 1997, Medium 1998 | |||||
| Trucks and buses | Light-duty vehicles (GVW 1.7t) |
10·15M (g/km) |
CO | 1988 | 2.70 (2.10) | |||
| HC | 1988 | 0.62 (0.40) | ||||||
| NOx | 1997 | 0.55 (0.40) | ||||||
| PM | 1997 | 0.14 (0.08) | ||||||
| Medium-duty vehicles (1.7t GVW2.5t) |
10·15M (g/km) |
CO | 1993 | 2.70 (2.10) | ||||
| HC | 1993 | 0.62 (0.40) | ||||||
| NOx | 1997, 1998 |
0.97 (0.70) | MTM 1997 | |||||
| PM | 1997, 1998 |
0.18 (0.09) | ATM 1998 | |||||
| Heavy-duty vehicles (2.5t GVW) |
D13M (g/kWh) |
CO | 1994 | 9.20 (7.40) | ||||
| HC | 1994 | 3.80 (2.90) | ||||||
| NOx | DI | 1997, 1998, 1999 | 5.80 (4.50) | GVW3.5t, 1997 3.5t GVW12t, 199812t GVW,1999 |
||||
| IDI | ||||||||
| PM | 1997, 1998, 1999 | 0.49 (0.25) | ||||||
| 2- wheeled motor vehicles |
4-cycled | 2- wheel motor vehicles (g/km) |
CO | 1998, 1999 |
20.0(13.0) | * | ||
| HC | 1998, 1999 |
2.93 (2.00) | ||||||
| NOx | 1998, 1999 |
0.51 (0.30) | ||||||
| 2-cycle | 2- wheel motor vehicles (g/km) |
CO | 1998, 1999 |
14.4 (8.00) | ||||
| HC | 1998, 1999 |
5.26 (3.00) | ||||||
| NOx | 1998, 1999 |
0.14 (0.10) | ||||||
- Notes:
- 1.carbon monoxide(CO), hydrocarbons(HC), nitrogen oxides(NOx), particulate matter(PM)
- 2.The value 2.70(2.10) indicates 2.70 as the maximum permissible value for the vehicle and 2.10 as the average value for the vehicle type.
- 3.10·15-mode(10·15M) represents a typical driving pattern in urban areas. 11-mode (11 M) is typical driving pattern of cold-started vehicle traveddng from suburbs to the urban center.
- 4.For diesel motor vehicles, the "small-size vehicles" are vehicles with an equivalent inertia weight (EIW) of 1.25t (vehicle weight of 1.265t) or less, and the "medium-size vehicles" are vehicles with EIW of more than 1.25t (vehicle wight of 1.265t).
- 5."MTM" and "ATM" stand for manual transmission and automatic transmission respectively.
- 6."ID" and "IDI" stand for direct injection and indirect injection respectively.
- *Enforcement year
- (i)Motorcycle type I, mini-size two-wheel motor vehicle: 1998
- (ii)Motorcycle type II, two-wheel motor vehicle: 1999