What are the differences between National IV and National V standards?
4 Answers
The differences between National IV and National V standards include: 1. Different vehicle environmental labels: National IV has environmental labels while National V canceled them. 2. Different emission standards: The nitrogen oxide emission limit for National IV is 0.8 grams per kilometer, while for National V it's 0.06 grams per kilometer, with added restrictions on particulate matter concentration. 3. Different pollution levels: The olefin content standard for National IV is 28%, while for National V it's 24%. The main emission pollutants for both standards are: 1. Hydrocarbons; 2. Nitrogen oxides; 3. Carbon monoxide; 4. Particulates.
I usually pay attention to automotive emission standards, and the difference between China IV and China V is quite noticeable. China V is much stricter than China IV, significantly lowering the limits for carbon monoxide, hydrocarbons, and nitrogen oxides, with particularly stringent requirements for particulate matter in diesel vehicles. To meet China V standards, vehicles are equipped with catalytic systems like SCR to reduce harmful gas emissions. In daily driving, China V vehicles are more fuel-efficient and offer more stable performance, though they might cost a few thousand yuan more initially. Maintenance-wise, China V vehicles have more complex technology and higher-priced parts, while China IV vehicles are simpler but may consume more fuel. Environmentally, China V vehicles fare better in cities with driving restrictions, so I recommend choosing China V to support the environment. In the long run, they are more reliable, reduce pollution issues, and significantly enhance the overall driving experience.
As an environmental enthusiast, I believe the China V emission standard is a significant step forward for environmental protection. The China IV standard was relatively lenient, allowing more hydrocarbons and nitrogen oxides to be emitted, which polluted the air. In contrast, China V substantially lowered these limits, with particular emphasis on controlling volatile organic compounds. For diesel vehicles, China V mandates the use of DPF (Diesel Particulate Filters) to trap particulate matter, significantly reducing smog issues. On a societal level, the adoption of China V standards can improve public health by lowering health risks. I've also noticed that China V-compliant vehicles are more fuel-efficient, indirectly reducing greenhouse gas emissions. This embodies the concept of sustainable development, and we should prioritize purchasing vehicles with higher emission standards to collectively protect our green planet.
Technically speaking, China 5 represents a significant upgrade over China 4. The key differences lie in stricter emission limits: hydrocarbon limits for gasoline vehicles dropped from 0.3g/km to 0.06g/km, while diesel vehicles saw nitrogen oxide limits halved with added particulate standards. To achieve this, manufacturers adopted SCR or DPF exhaust treatment systems and optimized engines. OBD systems were also enhanced for smarter fault monitoring. The result is cleaner vehicles with reduced pollutants. These modifications make China 5 vehicles operate more efficiently with reliable performance, slightly higher maintenance costs but greater environmental benefits.
