What does the National 5 Emission Standard mean?
2 Answers
The National 5 Emission Standard refers to the fifth-stage national standard for motor vehicle pollutant emissions. It imposes stricter limits on nitrogen oxides (NOx), hydrocarbons (HC), carbon monoxide (CO), and particulate matter (PM) emitted by vehicles. The purpose is to reduce and prevent environmental pollution caused by vehicle exhaust, protect the ecological environment, and ensure human health. The requirements of the National 5 Standard are: 1. The carbon monoxide (CO) emission per kilometer driven must not exceed 1000 milligrams; 2. The non-methane hydrocarbon (NMHC) emission per kilometer driven must not exceed 68 milligrams; 3. The nitrogen oxide (NOx) emission per kilometer driven must not exceed 60 milligrams; 4. The fine particulate matter (PM) emission per kilometer driven must not exceed 4.5 milligrams.
I've been driving for many years and often hear people talk about the National 5 emission standard, which is actually China's fifth-stage regulation on vehicle pollutant emissions. It sets maximum limits for harmful substances in exhaust gases such as carbon monoxide, nitrogen oxides, and particulate matter. Implemented nationwide since 2017, its purpose is to make the air cleaner. The National 5 standard mainly affects gasoline and diesel vehicles—for example, new cars must comply to be registered. It's stricter than National 4, helping reduce urban smog risks. When buying or replacing a car, owners should check the emission standard marked on the vehicle certificate to avoid driving restrictions in certain areas. The promotion of National 5 has also pushed automakers to upgrade engine technology, using three-way catalytic converters to filter exhaust. This is important for daily driving because cleaner air means fewer respiratory diseases. I also recommend regular maintenance to check for exhaust leaks. Overall, environmental protection isn't just a slogan—National 5 is real action, and ordinary people can contribute by choosing low-emission vehicles for their travels.
