What does China III and China IV mean for vehicles?

[DelMarcus]

China III and China IV refer to the vehicle emission standards, with China IV being more stringent than China III. The China III emission standard, officially known as the National Phase III Motor Vehicle Pollutant Emission Standard, was implemented nationwide on July 1, 2007. It is equivalent to the Euro III emission standard in terms of tailpipe pollutant levels, with the key difference being that new vehicles must be equipped with an OBD (On-Board Diagnostics) system. The China IV emission standard, officially the National Phase IV Motor Vehicle Pollutant Emission Standard, mandates that only China IV-compliant vehicles can be registered starting from July 2011. The OBD system under China IV features increased monitoring points and systems, including oxygen sensors at both the inlet and outlet of the three-way catalytic converter, to ensure real-time monitoring and compliance with emission standards.

[DelRonan]

National III and National IV are topics I often discuss in car enthusiast groups. Simply put, they are China's vehicle emission standard codes, with National III representing the third stage and National IV the fourth stage. National III was implemented around 2007, requiring new vehicles to reduce pollutants like hydrocarbons and carbon monoxide in exhaust emissions, basically equivalent to Euro III internationally. National IV is stricter, introduced around 2011, imposing much lower limits on nitrogen oxides and particulate matter, comparable to Euro IV. Why implement them in stages? Because pollution control is a gradual process; in the early years, vehicle exhaust made cities hazy, but after the upgrades to National III and IV, air quality has indeed improved significantly. An old comrade of mine who drives a taxi complained that switching to a National IV vehicle was more expensive, but it's worth it in the long run because National III vehicles are now banned from entering the ring roads in big cities. So understanding these standards is crucial for us when choosing and using cars—don't buy vehicles that are too old to avoid problems.

[WalkerFitz]

I've always been concerned about environmental issues, so I pay close attention to China III and China IV emission standards. These standards target vehicle exhaust emissions - China III is relatively lenient, mainly reducing basic pollutants, implemented around 2007; while China IV is stricter, introduced in 2011, with tighter controls on PM2.5 and nitrogen oxides. This means less smoke on the roads and better respiratory health. Living in the city, I can feel the air becoming cleaner after these implementations, especially with traffic restriction policies phasing out China III vehicles from main roads. The government continues to upgrade standards, with China V and VI now in place, collectively laying the foundation for sustainable transportation. When choosing a car, I recommend prioritizing China IV or higher standards to avoid being affected by new regulations while saving some fuel costs. Additionally, environmentally conscious people understand that phasing out high-emission vehicles benefits future generations - this isn't trivial and requires ongoing attention to policy developments.

[DiLucille]

When buying a car, the salesperson kept emphasizing the emission standards, so I researched the difference between China III and China IV. China III is an earlier standard, effective in 2007, with relatively basic exhaust control. China IV was introduced in 2011 with stricter requirements, significantly reducing pollutant emissions. As a new car owner, I test-drove some cheaper China III used cars but found higher risks: annual inspections often fail the exhaust test, and some cities restrict vehicles below China IV. Now, just check the label on the vehicle registration certificate—it clearly states the standard. I recommend spending a few thousand more for China IV or directly opting for China VI to avoid future hassles. I’ve seen friends lose money selling cars due to this issue—understanding policies in advance saves headaches. Plus, with the electric trend rising, these standard upgrades are key for the future, making car-buying decisions much simpler.