What are the vehicle emission standards?
2 Answers
Vehicle emission standards include National I, National II, National III, National IV, National V, and National VI. Currently, the domestic vehicle emission standards are National V and National VI. The National V emission standard was officially implemented on January 1, 2017, while the National VI standard was implemented in 2020. The National V vehicle emission standard is equivalent to the Euro V standard in the European Union, imposing stricter limits on hydrocarbon, nitrogen oxide, carbon monoxide, and particulate emissions from motor vehicles. From National I to National V, each upgrade in the standard reduces single-vehicle pollutants by 30% to 50%. Compared to the National V emission standard, the National VI emission standard is more stringent in terms of testing standards and pollutant emissions. The test cycle has been changed from NEDC to WLTC standards, with the addition of real-world driving emission tests. The pollutant limits are stricter, with a 40% to 50% increase in stringency compared to National V. The CO and HC limits are about one-third stricter than those of National V.
I've been driving for over 20 years, and vehicle emission standards are truly important. For example, Europe's Euro standards have become increasingly stringent from Euro 1 to Euro 7, while China has national standards like China 5 and China 6. These mainly regulate the emission of pollutants such as carbon monoxide and nitrogen oxides. Non-compliant vehicles emit black smoke from their exhaust. In the past, no one paid attention when driving older cars, but now new vehicles must be equipped with catalytic converters for filtration. If you don't comply, you won't pass the annual inspection and may incur additional repair costs. I think the progress in standards is good; the air is a bit cleaner, and driving feels more reassuring. The China 6-compliant car I recently bought even has slightly lower fuel consumption. The mechanic said that regularly replacing the air filter and engine oil can maintain good emissions, which isn't just about saving money but also about the next generation. In short, everyone should pay attention to which year's standard their car meets to avoid exceeding the limits.
