On January 9, 2026, the Ministry of Agriculture and Environment issued Circular No. 92/2025/TT-BNNMT, stipulating the National Technical Standard on exhaust emissions from motorcycles and scooters participating in road traffic, officially effective from June 30, 2026. This is considered a significant step in the effort to control air pollution and reduce emissions from the transportation sector, in line with Vietnam’s sustainable development orientation and environmental commitments.
According to Circular QCVN 99:2025/BNNMT – National Technical Regulation on Emission of In-use Motorcycles, Mopeds, this standard applies to motorcycles and mopeds currently in circulation, excluding vehicles under the management of the Ministry of National Defense and the Ministry of Public Security. The implementation roadmap will be stipulated by the Prime Minister to ensure suitability with socio-economic conditions and practical feasibility.
The National Technical Standard on Emissions from Motorcycles and Mopeds specifies four maximum permissible limits for the main pollutant parameters in exhaust gases, including Hydrocarbons (HC) and Carbon Monoxide (CO) – two factors that significantly contribute to urban air pollution and negatively impact public health.
According to the National Technical Standard QCVN 99:2025/BNNMT issued with Circular No. 92/2025/TT-BNNMT, only two exhaust gas parameters have specified limit values for motorcycles and mopeds participating in road traffic:
Carbon Monoxide (CO)
Hydrocarbons (HC)
| Emission Parameters | Motorcycles, Mopeds | ||||
| Level 1 | Level 2 | Level 3 | Level 4 | ||
| CO (% volume) | 4,5 | 4,5 | 3,5 | 2,0 | |
| HC (ppm volume) | 4-stroke engine | 1.500 | 1.200 | 1.100 | 1.000 |
| 2-stroke engine | 10.000 | 7.800 | 2.000 | 2.000 | |
Below is a table of parameters and maximum permissible limit values according to QCVN 99:2025/BNNMT:
Note:
The above values apply to forced-ignition engines of motorcycles and mopeds currently in circulation participating in road traffic.
HC is converted to the equivalent of C6H14 in the standard.
The standard does not specify limits for other indicators such as NOx, PM, or CO2.
Emission testing will be conducted at certified facilities using measuring equipment that meets the technical requirements of QCVN 103:2024/BGTVT and other relevant legal regulations. According to statistics from the Vietnam Register, there are currently over 70 million motorcycles and scooters in circulation nationwide, creating a significant demand for infrastructure and testing capacity in the coming period.
Based on its assigned functions, the Ministry of Construction will organize the implementation of emission testing. The management agencies emphasize that the application of the new standard for motorcycles needs to be carried out cautiously, with a clear roadmap, ensuring both environmental effectiveness and minimizing negative impacts on the public.
In the context of increasing air pollution in major cities, Circular No. 92/2025/TT-BNNMT is not only significant in terms of technical management but also serves as an important policy tool to promote emission reduction, improve air quality, and aim towards the goal of sustainable transportation development, in line with ESG trends and green transition in Vietnam.
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