Thông tư 06/2025/TT-BNNMT về Quy chuẩn kỹ thuật quốc gia khí thải xe ô tô tham gia giao thông đường bộ do Bộ trưởng Bộ Nông nghiệp và Môi trường ban hành

CIRCULAR

ON NATIONAL TECHNICAL REGULATION ON EMISSIONS OF IN-USE AUTOMOBILES

Pursuant to the Law on Standards and Technical Regulations dated June 29, 2006;

Pursuant to the Law on Environmental Protection dated November 17, 2020;

Pursuant to the Law on Road Traffic Order and Safety dated June 27, 2024;

Pursuant to Decree No. 127/2007/ND-CP dated August 01, 2007 of the Government detailing the implementation of a number of articles of the Law on Standards and Technical Regulations; Decree No. 78/2018/ND-CP dated May 16, 2018 of the Government amending a number of Articles of the Government's Decree No. 127/2007/ND-CP dated August 01, 2007 elaborating the implementation of a number of Articles of the Law on Standards and Technical Regulations;

Pursuant to Decree No. 35/2025/ND-CP dated February 25, 2025 of the Government on functions, tasks, powers and organizational structure of the Ministry of Agriculture and Environment of Vietnam;

At the request of the head of Vietnam Environment Agency and Director General of Department of Science and Technology;

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Article 1. The national technical regulation on emissions of in-use automobiles (QCVN 85:2025/BNNMT) is attached to this Circular.

Article 2. Effect

This Circular comes into force from December 16, 2025.

Article 3. Transitional provision

In-use automobiles shall apply the emissions standards prescribed in Decision No. 16/2019/QD-TTg dated March 28, 2019 of the Prime Minister on the roadmap for application of emissions standards for in-use automobiles and imported used automobiles until the Prime Minister promulgates the new Decision replacing the Decision No. 16/2019/QD-TTg.

Article 4. Implementation

1. Ministers; Heads of governmental authorities; People's Committees of all levels; relevant authorities and individuals are responsible for implementing this Circular.

2. Should any issue arise during the implementation of this Circular, report in writing to the Ministry of Agriculture and Environment for consideration and resolution./.

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PP. MINISTER
DEPUTY MINISTER




Le Cong Thanh

QCVN 85:2025/BNNMT

NATIONAL TECHNICAL REGULATION ON EMISSIONS OF IN-USE AUTOMOBILES

Foreword

QCVN 85:2025/BNNMT is compiled by the Vietnam Environment Agency, approved by the Department of Science and Technology, appraised by the Ministry of Science and Technology, and promulgated by the Ministry of Agriculture and Environment under Circular No. 06/2025/TT-BNNMT dated June 16, 2025.

NATIONAL TECHNICAL REGULATION ON EMISSIONS OF IN-USE AUTOMOBILES

1. GENERAL REGULATIONS

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This Regulation specifies the limit values of emissions parameters for in-use automobiles including Carbon Monoxide (CO), Hydrocarbon (HC) in the emissions of automobiles equipped with spark-ignition engines, and the smoke opacity of emissions from automobiles equipped with compression-ignition engines.

1.2. Regulated entities

1.2.1. This Regulation applies to authorities, organizations and individuals owning in-use automobiles; organizations and individuals engaging in inspection of emissions of in-use automobiles; and relevant state management authorities.

1.2.2. This Regulation does not apply to automobiles under management of the Ministry of National Defense and Ministry of Public Security.

1.3. Definitions

For the purposes of this Regulation, the terms below shall be construed as follows:

1.3.1. In-use automobiles refer to automobiles prescribed in point a, clause 1, Article 34 of the Law on Road Traffic Order and Safety, granted certificates of vehicle registration and license plates in accordance with Vietnamese law (hereinafter referred to as automobiles).

1.3.2. Spark-ignition engine refers to an internal combustion engine that operates on the principle of forced combustion using an external heat source.

1.3.3. Compression-ignition engine refers to an internal combustion engine that operates on the principle of fuel self-ignition under high temperature and pressure.

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2. TECNICAL REGULATIONS

The permissible limit values for CO, HC, and smoke opacity, N (%HSU) parameters of emissions of automobiles are prescribed in the following table:

Table 1. PERMISSIBLE LIMIT VALUES FOR PARAMERTERS OF EMISSIONS OF AUTOMOBILES

Parameters of emissions of automobiles

Automobiles equipped with spark-ignition engines

Automobiles equipped with compression-ignition engines

Level 1

Level 2

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Level 4

Level 5

Level 1

Level 2

Level 3

Level 4

Level 5

CO (% by volume)

4,5

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3,0

0,5

0,3

-

-

-

-

-

HC (ppm by volume)

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1.200

800

600

300

150

-

-

-

-

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- Two-stroke engines

7.800

7.800

7.800

7.800

7.800

-

-

-

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-

- Special engines ⁽¹⁾

3.300

3.300

3.300

3.300

3.300

-

-

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-

-

Smoke opacity, N (%HSU) ⁽²⁾

-

-

-

-

-

72

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50

45

35

Note:

⁽¹⁾ Special engines refer to engines such as Wankel engines and some other types of engines with special constructions different from the common piston and piston ring engines.

⁽²⁾ The smoke opacity limit can also be determined according to the values of the light absorption coefficient (m⁻¹) equivalent to the smoke opacity values prescribed above.

“-”: No regulation prescribes such matters.

3. METHODS FOR DETERMINATION

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For automobiles equipped with spark-ignition engines, the concentrations of CO and HC in the emissions are determined in accordance with TCVN 6204:2008 (ISO 3929:2003) — Road vehicle – Measurement methods for exhaust gas emissions during inspection or maintenance.

3.2. Methods for measurement of parameters of emissions of automobiles equipped with compression-ignition engines

3.2.1. Measurement methods

The measurement of smoke opacity in emissions of automobiles equipped with compression-ignition engines is carried out by measuring emissions samples in accordance with free-acceleration tests for engines. The free-acceleration tests for engines (hereinafter referred to as free-acceleration tests) are prescribed in section 9.4.2 of TCVN 7663:2007 (ISO 11614:1999) — Reciprocating internal combustion compression-ignition engine - Apparatus for measurement of the opacity and for determination of the light absorption coefficient of exhaust gas.

3.2.2. Measurement procedures

The procedures for measurement of emissions of automobiles equipped with compression-ignition engines is carried out in accordance with steps 9.4.1 and 10.1.6 of TCVN 7663:2007 (ISO 11614:1999).

The free-acceleration tests shall be carried out at least three times. The arithmetic mean of the last three values is taken as the measurement result. The result is considered valid if the difference between the highest and lowest values of the last three free-acceleration tests does not exceed 10 (% HSU).

For measurement results expressed as the light absorption coefficient (m⁻¹), the smoke opacity, N (% HSU) may be converted using formula (1) in Section A.2 of Appendix A (Method for measuring smoke opacity of automobiles equipped with compression-ignition engines) of TCVN 6438:2018 — Road vehicles - Maximum permitted limits of exhaust gases.

4. MANAGEMENT REGULATIONS

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4.2. The equipment for measurement of emissions of automobiles shall satisfy the national technical regulation prescribed in QCVN 103:2024/BGTVT — National technical regulations on Technical facilities and location of Vehicle Inspection Station, motorcycles and mopeds Emission Inspection Stations.

5. IMPLEMENTATION

5.1. The Ministry of Construction and Ministry of Agriculture and Environment, within their functions and tasks, shall assign affiliated units to provide guidelines and organize the implementation of this Regulation for inspection of emissions of automobiles.

5.2. If the documents referenced in this Regulation are amended or replaced, the newer documents shall prevail./.