What are the differences between National IV and National V?
2 Answers
The differences between National IV and National V are: 1. Different release dates: The National IV vehicle pollutant emission standard was released on December 30, 2005; the National V vehicle pollutant emission standard was released on September 17, 2013. 2. Different contents: The main pollutants emitted by National IV vehicles include HC, NOx, CO, PM, etc.; the National V standard emission control level is equivalent to the European Stage 5 emission standard currently in effect. 3. Different strictness: The National IV standard can reduce nitrogen oxide emissions by 25% for light-duty vehicles and 43% for heavy-duty vehicles. Based on Shanghai's annual vehicle registration volume of approximately 350,000 units, it is estimated that annual new vehicles can reduce nitrogen oxide emissions by about 1,000 tons; the National V standard emission control level in China is equivalent to the European Stage 5 emission standard currently in effect.
I've been closely following vehicle emission standards. There are two main differences between China IV and China V standards. Firstly, the pollutant limits are significantly stricter - China V requires about 30% lower carbon monoxide and nitrogen oxide emissions compared to China IV, with particularly tighter control on particulate matter (PM). For instance, heavy-duty diesel vehicles under China V must be equipped with SCR systems to treat exhaust gases. Secondly, the testing methodology was upgraded - China V introduced more realistic real-world driving tests that better simulate daily driving conditions, preventing automakers from cheating. From an owner's perspective, China V compliant vehicles may have slightly higher fuel consumption but emit less pollution, making them more environmentally friendly in the long run. I recall China IV was fully implemented in 2011, while China V was rolled out after 2017. Nowadays, major cities basically only license China V vehicles, making used China IV vehicles hard to sell, and requiring extra attention to whether the catalytic converters meet standards during maintenance.
