Thailand: On-Road Vehicles and Engines

Vehicle emission standards in Thailand are developed by the Thai Industrial Standards Institute (TISI), an agancy within the Ministry of Industry, and the Pollution Control Department (PCD), an agancy of the Ministry of Natural Resources and Environment.

Thai emission regulations are based on European emission standards and test procedures. The regulations are published as Thai Industrial Standards (TIS).

Emission standards for light-duty vehicles—passenger cars and light commercial vehicles—are summarized in Table 1. The dates are applicable for new types, all types must comply one year later. Emission standards for heavy-duty truck and bus engines are summarized in Table 2.

**Table 1**
Emission Standards for Light-Duty Vehicles
Date	EU Reference Standard	Thai Standard
1997	Euro 1	TIS 1440-2540 gasoline TIS 1435-2540 diesel
1999	Euro 2	TIS 1870-2542 gasoline TIS 1870-2542 diesel
2006	Euro 3^a	TSI 2160-2546 gasoline TSI 2155-2546 diesel
2012	Euro 4^b
^a Without EOBD ^b With EOBD, without in-use conformity

**Table 2**
Emission Standards for Heavy-Duty Diesel Engines
Date	EU Reference Standard	Thai Standard
1998.05	Euro I
2000.05	Euro II	TIS 1295-1998
2008.01	Euro III	TIS 2315-2550
2012.01	Euro IV	TIS 2315-2551