New Vehicle Regulations

Emission standards for on-road vehicles in Thailand are formulated by the Pollution Control Department (PCD) and adopted by the Ministry of Industry (MOI) and/or the Ministry of Science, Technology and Environment (MOSTE).

New diesel vehicle regulations are based on European standards and emission test procedures, as summarized in the following Table 1 and Table 2 for heavy- and light-duty vehicles, respectively.

Table 1
Heavy Duty Diesel Fueled Vehicles (g/kWh)
Tier Effective Reference Std. CO HC PM NOx
1  - ECE R 49-01 11.2 2.4 - 14.4
2 12 May 1998 EURO I 4.5 1.1 0.36 8.0
3 1 Jan 1999* EURO II 4.0 1.1 0.15 7.0
* proposed
Table 2
Light Duty Diesel Fueled Vehicles
Tier Effective Reference Std. Type Weight (kg) CO HC+NOx PM
1 29 Jan 1995 ECE R 83 PC <= 6 seats, <1400cc. - 45 g/test 15 g/test** -
 PC <= 6 seats, >=1400cc.  - 30 g/test 8 g/test -
ECE R 15-04 6 < PC <= 9 seats
PC > 2500 kg
Truck <= 3500 kg		 R <= 1020 58 g/test 19 g/test -
1020 <R <= 1250 67 g/test 20.5 g/test -
1250 <R <= 1470 76 g/test 22 g/test -
1470 <R <= 1700 84 g/test 23.5 g/test -
1700 <R <= 1930 93 g/test 25 g/test -
1930 <R <= 2150 101 g/test 26.5 g/test -
2150 <R 110 g/test 28 g/test -
2 23 Feb 1996 ECE R 83 PC <= 6 seats - 2.72 g/km 0.97 g/km 0.14 g/km
ECE R 15-04 6 < PC <= 9 seats
PC > 2500 kg
Truck <= 3500 kg		 R <= 1020 58 g/test 19 g/test -
1020 <R <= 1250 67 g/test 20.5 g/test -
1250 <R <= 1470 76 g/test 22 g/test -
1470 <R <= 1700 84 g/test 23.5 g/test -
1700 <R <= 1930 93 g/test 25 g/test -
1930 <R <= 2150 101 g/test 26.5 g/test -
2150 <R 110 g/test 28 g/test -
3 1 Jan 1997 ECE R 83-01 (B) PC <= 6 seats - 2.72 g/km 0.97 g/km 0.14 g/km
93/59/EEC  6 < PC <= 9 seats
PC > 2500 kg Truck <= 3500 kg		 R <= 1250 2.72 g/km 0.97 g/km 0.14 g/km
1250 <R <= 1700 5.17 g/km 1.40 g/km 0.19 g/km
1700 < R 6.90 g/km 1.70 g/km 0.25 g/km
4 1 Jan 1999*
30 Sep 2001 (DI)*		 94/12/EC PC <= 6 seats - 1.00 g/km 0.70 g/km 0.08 g/km
93/59/EEC 6 < PC <= 9 seats
PC > 2500 kg Truck <= 3500 kg		 R <= 1250 2.72 g/km 0.97 g/km 0.14 g/km
1250 <R <= 1700 5.17 g/km 1.40 g/km 0.19 g/km
1700 < R 6.90 g/km 1.70 g/km 0.25 g/km
5 1 Oct 1999
(R <= 1250 kg)*
1 Oct 2000
(R > 1250 kg)*
30 Sep 2001 (DI)*		 94/12/EC PC <= 6 seats - 1.00 g/km 0.70 g/km 0.08 g/km
96/69/EC 6 < PC <= 9 seats
PC > 2500 kg Truck <= 3500 kg		 R <= 1250 1.00 g/km 0.70 g/km 0.08 g/km
1250 <R <= 1700 1.25 g/km 1.00 g/km 0.12 g/km
1700 < R 1.50 g/km 1.20 g/km 0.17 g/km
* proposed
** 6 g/test NOx

In-Use Vehicle Regulations

In-use diesel vehicles in Thailand must meet the following black smoke standards.

Table 3
Diesel Vehicle Black Smoke Standards
Standard Measuring System Measuring Method
50% Filter Free Acceleration
45% Opacity
40% Filter Full Load
35% Opacity

All data courtesy of the Pollution Contol Department, Thailand (March 1998).