Conventional pollutant emission limits
Pollution Control Department (PCD)
Euro III (in Thai)
Motor vehicles over 3,500 kg, equipped with compression ignition engines or positive ignition natural gas (NG) or (liquified petroleum gas) LPG engines.
Thailand has subscribed to the European system of heavy-duty vehicle emissions standards since May 1998.
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).
The Pollution Control Department was established on June 4, 1992, under the Royal Decree on the Organizational Division of Pollution Control Department, Ministry of Science, Technology and Environment B.E. 2535(1992), as result of the Enhancement and Conversation of the National Environment Quality Act B.E. 2535 (1992).
New Vehicle Regulations
New heavy-duty diesel vehicle regulations are based on European standards and emission test procedures.
|Standard Level||Reference standard||Test Cycle||CO||HC||NOx||PM||NMHC||CH4(1)||Smoke||Enforcement Date|
|Euro I||4.5||1.1||8.0||0.36||–||–||–||12 May 1998|
|Euro II||4.0||1.1||7.0||0.15||–||–||–||23 May 1999|
|Euro III||ESC, ELR||2.1||0.66||5.0||0.10/0.13(2)||–||–||0.8||1 Jan 2007|
|Euro III EEV||1.5||0.25||2.0||0.02||–||–||0.15|
|Euro III EEV||3.0||–||2.0||0.02||0.40||0.65||–|
(1) For engines that use natural gas as fuel
(2) for engines of less than 0.75 dm3 swept volume per cylinder and a rated power speed of more than 3000 min-1
EEV – Enhanced Environmentally-Friendly Vehicles
In-Use Vehicle Regulations
In-use diesel vehicles in Thailand must meet the following black smoke standards.1
|Standard||Measuring System||Measuring Method|
Pollution Control Department (PCD) Emission Standards for Mobile Sources (in Thai)