Vietnam introduces first motorcycle emission standard

The ministry of agriculture and environment has issued vietnam's first motorcycle emission standard, with implementation details to be determined by the government.

Vietnam will implement its first national technical regulation on motorcycle emissions, including those from large-displacement bikes, starting 1/6. This regulation, outlined in circular 92 issued by the Ministry of Agriculture and Environment in late december 2025, sets limits for two key exhaust parameters: CO (carbon monoxide) and HC (hydrocarbons), categorized into 4 levels.

Level 1 allows a CO limit of 4.5% and an HC limit of up to 10,000 ppm for two-stroke engines. These limits are comparable to, or even more lenient than, Europe's Euro 1 and 2 standards, which have significantly controlled CO and HC emissions since the late 1990s.

Level 2 sets a CO limit of 4.5% and an HC limit of 7,800 ppm for two-stroke engines. This level approaches Euro 2 standards, reflecting a transitional phase where environmental requirements are tightened yet remain practical for existing older vehicles.

Motorcycles are the primary mode of transport in Vietnam. Photo: Hoang Giang

Level 3 introduces stricter standards, with CO limited to 3.5% and HC for four-stroke engines reduced to 1,100 ppm, while two-stroke engines face a tighter limit of 2,000 ppm. This level is comparable to Euro 3 emission standards.

Similarly, level 4 sets the CO limit at 2% and HC for four-stroke engines at 1,000 ppm. This highest level approaches Euro 4 standards, which are widely applied to motorcycles in Europe.

However, the specific implementation roadmap for these standards will be determined later by the government.

The new regulation applies to individuals and organizations that use or inspect motorcycle emissions, as well as relevant state management agencies. Emission inspections must be conducted at facilities authorized by law.

Implementing these emission standards aims to reduce air pollution and protect public health. This policy also encourages a shift towards cleaner fuel vehicles, aligning with Vietnam's international commitments to reducing greenhouse gas emissions and fostering sustainable urban transport development.