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What is the difference between China V and China VI emission standards?

2 Answers

DiJulianna

07/25/25 11:40am

The differences between China V and China VI emission standards lie in emission limits, release dates, and issuing authorities. Specific details are as follows: Emission limits: The China VIa standard sets the carbon monoxide limit at 700 milligrams per kilometer, while the China VIb standard reduces it to 500 milligrams per kilometer. The China V standard allows 1000 milligrams per kilometer. Release dates: The China VI standard was released on June 22, 2018; the China V standard was released on September 17, 2013. Issuing authorities: The China VI standard was jointly issued by the Ministry of Environmental Protection and the General Administration of Quality Supervision, Inspection and Quarantine; the China V standard was issued by the Ministry of Environmental Protection.

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Joanna

08/11/25 8:05pm

I’ve been driving a lot and noticed that the biggest difference between China 5 (CN5) and China 6 (CN6) emission standards lies in the strictness of pollutant limits. CN5, introduced several years ago, had relatively lenient requirements for emissions like carbon monoxide and nitrogen oxides. In contrast, CN6 is far more stringent, especially in reducing particulate emissions significantly. In terms of implementation, CN5 was gradually enforced starting in 2017, while CN6 was rolled out in phases beginning in 2020—now, most new cars comply with CN6. Technically, CN6 adopts more advanced testing methods, such as Real Driving Emissions (RDE) tests, which better reflect actual pollution levels. This directly impacts vehicle design and performance: CN6-compliant cars feature upgraded engines and exhaust after-treatment systems. While driving feel may remain similar, their environmental performance improves notably, particularly in reducing smog during urban traffic congestion. As an experienced driver, I believe prioritizing CN6-compliant vehicles is wiser, especially since many regions now restrict CN5 cars on the road.

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