What are China 5 and China 6?

[PaulLee]

The distinction between China 5 and China 6 in vehicles can be seen from the emission standard letters on the rear of the car. China 5 is denoted by 'V', while China 6 is denoted by 'VI'. The differences between the two are as follows: Different emission standards: The emission standards for China 6 are more than 30% stricter than those for China 5. Excluding the influence of driving conditions and testing, gasoline vehicles under China 6 have a 50% reduction in carbon monoxide emissions, a 50% reduction in total hydrocarbons and non-methane hydrocarbons, and a 42% reduction in nitrogen oxide emissions. Different implementation times: The China 5 standard was implemented nationwide on January 1, 2017, as the fifth phase of the national motor vehicle emission standards. China 6 was implemented starting July 1, 2019. Different principles: Under China 5, the emission standards for diesel and gasoline vehicles were different, but China 6 adopts a fuel-neutral principle, meaning that regardless of the fuel type, the emission limits are the same. Different issuing authorities: The China 5 standard was issued by the Ministry of Environmental Protection, while the China 6 standard was issued by the Ministry of Environmental Protection and the General Administration of Quality Supervision, Inspection, and Quarantine. Different letter representations: China 5 is represented by 'V', while China 6 is represented by 'VI'. Different monitoring requirements for plug-in hybrid electric vehicles: Compared to China 5, China 6 has improved monitoring requirements for plug-in hybrid electric vehicles, including regulations on energy storage systems, thermal management systems, brake regeneration, drive motors, generators, etc. The China 5 standard limits are as follows: Gasoline vehicles must not emit more than 1,000 milligrams of carbon monoxide per kilometer driven. Gasoline vehicles must not emit more than 68 milligrams of non-methane hydrocarbons per kilometer driven. Gasoline vehicles must not emit more than 60 milligrams of nitrogen oxides per kilometer driven. Gasoline vehicles must not emit more than 4.5 milligrams of PM (particulate matter) per kilometer driven. China 6 has two standards: China 6a and China 6b, as follows: China 6a standard limits: Gasoline vehicles must not emit more than 700 milligrams of carbon monoxide per kilometer driven. Gasoline vehicles must not emit more than 68 milligrams of non-methane hydrocarbons per kilometer driven. Gasoline vehicles must not emit more than 60 milligrams of nitrogen oxides per kilometer driven. Gasoline vehicles must not emit more than 4.5 milligrams of PM per kilometer driven. China 6b standard limits: Gasoline vehicles must not emit more than 500 milligrams of carbon monoxide per kilometer driven. Gasoline vehicles must not emit more than 35 milligrams of non-methane hydrocarbons per kilometer driven. Gasoline vehicles must not emit more than 35 milligrams of nitrogen oxides per kilometer driven. Gasoline vehicles must not emit more than 3 milligrams of PM per kilometer driven. Affected by the China 6 emission policy, although China 5 vehicles are not currently restricted in normal use, with no driving or license plate restrictions, their resale value will be significantly impacted. For car owners, if they purchase a truck for hauling goods on loan, the depreciation of the vehicle after paying off the loan is equivalent to the net profit earned during that period. A higher residual value means more profit for the owner. Therefore, from this perspective, China 6 vehicles, with longer service life and more road rights, have more advantages.

[LaKaleb]

China V and China VI are two emission standards set by China for vehicle exhaust, simply put, the latter is a stricter new version. Back when I was into cars, I researched this—China V was implemented starting in 2017, limiting pollutants like carbon dioxide and nitrogen oxides, while China VI was fully rolled out after 2019, significantly raising the requirements, such as stricter limits on particulate matter. Anyone who’s driven a China V-compliant car knows it still used older testing methods, whereas China VI introduced more realistic on-road testing to ensure compliance during everyday driving. This transition aims to improve air quality and reduce smog. Overall, China VI reflects the country’s growing emphasis on environmental protection, pushing automakers to upgrade technologies like engines and catalytic converters.

[GiannaLynn]

I've been concerned about environmental protection for a long time, and the transition from China 5 to China 6 emission standards is particularly exciting. It represents a significant step forward for China in reducing air pollution. China 5 was the previous standard, allowing higher levels of exhaust emissions, while China 6 is much stricter, significantly cutting down on harmful gases like carbon monoxide and sulfides. This is extremely beneficial for urban environments, helping to reduce respiratory diseases. Nowadays, China 6-compliant vehicles are more common when purchasing new cars, and this standard also encourages the development of hybrid and electric vehicles, reducing reliance on fossil fuels. I always support green transportation and believe such policies should be widely promoted to help make our skies bluer. In the long run, upgrading these standards not only purifies the air but also fosters more sustainable driving habits.

[DelThomas]

For ordinary car owners, the difference between China 5 and China 6 emission standards significantly impacts car purchases. Simply put, China 6 is an upgraded version with stricter control over exhaust emissions. When buying a car, prioritize China 6 models as they face fewer restrictions in major cities and will likely have higher resale value in the future. Previously, China 5 cars were cheaper, but with current policies pushing for China 6, after the transition period, registering China 5 vehicles might become restricted. You can check the vehicle's compliance certificate to identify which standard it meets. In daily use, China 6 cars have similar fuel consumption but require higher-quality fuel. When choosing a car, consider long-term ownership costs—don't just go for cheaper, soon-to-be-outdated models.