The differences between China V and China VI emission standards are as follows: Different emission standards: The emission standards for China VI are more than 30% stricter than those for China V. Excluding the influence of working conditions and testing, gasoline vehicles under China VI emit 50% less carbon monoxide, 50% less total hydrocarbons and non-methane hydrocarbons, and 42% less nitrogen oxides compared to China V. Different implementation times: The China V standard was implemented nationwide on January 1, 2017. The China VI standard has been in effect since July 1, 2019. Different principles: Under China V, diesel and gasoline vehicles had different emission standards, but China VI adopts a fuel-neutral principle, meaning the emission limits are the same regardless of the fuel type. Different issuing authorities: The China V standard was issued by the Ministry of Environmental Protection, while the China VI standard was issued by the Ministry of Environmental Protection and the General Administration of Quality Supervision, Inspection, and Quarantine. Different letter representations: China V is represented by "V," while China VI is represented by "VI." Different monitoring requirements for plug-in hybrid vehicles: Compared to China V, China VI has enhanced monitoring requirements for plug-in hybrid vehicles, including regulations on energy storage systems, thermal management systems, brake regeneration, drive motors, generators, etc. Different prices: China VI vehicles are equipped with additional components compared to China V, and automakers also incur extra costs from vehicle certification, testing, and production. As a result, China VI vehicles are significantly more expensive than China V vehicles. Different decommissioning timelines: Although the government has abolished the mandatory retirement age for vehicles, older vehicles may be banned from roads, effectively rendering them obsolete. For example, a China V vehicle purchased in January 2019 and a China VI vehicle purchased at the same time may both have a 15-year registration period, but their actual usability will differ. For instance, China III vehicles from 2010 and China IV vehicles from the same year can still operate in Beijing, but as more cities impose restrictions, many older vehicles become practically unusable. Thus, even for vehicles of the same age, their usable lifespans may vary. China V emission limits are as follows: Gasoline vehicles must not emit more than 1,000 mg of carbon monoxide per kilometer driven. They must not emit more than 68 mg of non-methane hydrocarbons per kilometer, 60 mg of nitrogen oxides per kilometer, or 4.5 mg of PM (particulate matter) per kilometer. China VI has two standards: China VIa and China VIb. Their limits are as follows: China VIa emission limits: Gasoline vehicles must not emit more than 700 mg of carbon monoxide per kilometer driven. They must not emit more than 68 mg of non-methane hydrocarbons per kilometer, 60 mg of nitrogen oxides per kilometer, or 4.5 mg of PM per kilometer. China VIb emission limits: Gasoline vehicles must not emit more than 500 mg of carbon monoxide per kilometer driven. They must not emit more than 35 mg of non-methane hydrocarbons per kilometer, 35 mg of nitrogen oxides per kilometer, or 3 mg of PM per kilometer. Due to the China VI emission policy, although China V vehicles are not currently restricted from normal use, their resale value will be significantly affected. For truck owners, if they purchase a truck on loan for freight transport, the depreciation of the vehicle after paying off the loan is equivalent to their net profit during that period. A higher residual value means more profit for the owner. From this perspective, China VI vehicles, with their longer usability and greater road access, offer more advantages.
