What are the differences between National 5 and National 4?
2 Answers
National 5 and National 4 have the following differences: 1. Different release dates. National 4 was released on December 30, 2005; National 5 was released on September 17, 2013. 2. Different content. The National 4 standard refers to the main pollutants emitted by vehicles, including HC (hydrocarbons), NOx (nitrogen oxides), CO (carbon monoxide), and PM (particulate matter). It controls and reduces vehicle emissions to below specified levels through the application of technologies such as improved catalytic converter active layers, secondary air injection, and exhaust gas recirculation systems with cooling devices. The National 5 standard emission control level is equivalent to the European Stage 5 emission standard currently in effect. From National 1 to National 4, each upgrade in the standard reduces vehicle pollution by 30% to 50%. 3. Different strictness. Compared to the National 4 standard, the National 5 standard is more stringent, reducing nitrogen oxide emissions by 25% for light-duty vehicles and 43% for heavy-duty vehicles.
Last year I changed my car and researched the differences between China 5 and China 4 emission standards. China 4 vehicles comply with earlier emission standards with looser limits, emitting more pollutants that contribute to smog. China 5 standards are stricter, reducing NOx and hydrocarbon emissions for better urban air quality. China 5 cars cost more when purchasing but retain higher resale value, especially in cities like Beijing, Shanghai, and Guangzhou where they face no driving restrictions. China 4 vehicles are cheaper but may be banned from city centers in some restricted zones, affecting daily use. Performance-wise, they're similar - my China 5 car feels smooth with advanced emission controls and rarely shows warning lights. For maintenance, China 5's sophisticated systems pass annual inspections easily, while China 4 models are reliable but may face parts shortages during repairs. If budget allows and you prioritize environmental protection, China 5 is better. For cost savings with China 4, check local policies carefully to avoid inconveniences.
