What does the National 5 Emission Standard mean?
3 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.
While researching environmental topics, I discovered that China's National Phase 5 Emission Standard (China 5) refers to the fifth-stage national limits on motor vehicle pollutants. It significantly reduces concentrations of harmful emissions like carbon monoxide and nitrogen oxides from vehicles. For instance, China 5 diesel vehicles emit over 50% fewer particulate matters compared to China 4 standards. This translates to improved urban air quality and reduced health risks from PM2.5 exposure. After adopting China 5, major cities like Beijing and Shanghai mandated that new vehicles must comply, otherwise they'd be restricted from entering urban low-emission zones. I also noted parallels with European emission standards, showing China's alignment with global trends toward greener mobility. Car owners should check environmental labels when purchasing used vehicles to avoid high-pollution models. Long-term, these standards drive automakers to innovate with advanced after-treatment systems for cleaner exhaust. Though stricter regulations may slightly increase vehicle costs, investing in cleaner air for future generations is worthwhile. Health should come first – we all ought to support such progressive emission standard upgrades.
