Country 4 is the fourth stage automobile emission standard in China. Compared with country 3, the aftertreatment system has been upgraded, but the pollutant emission standard is reduced by 50% to 60%.
The fifth national standard is the fifth-stage motor vehicle emission standard in China, which has stricter restrictions on motor vehicle emissions such as nitrogen oxides, hydrocarbons, carbon monoxide and suspended particulate matter. Compared with the fourth national standard, the emission of nitrogen oxides should be reduced by 25%, and the emission limits of non-methane hydrocarbons and PM should be increased, thus reducing air pollution and preventing smog.
Extended data
Specific requirements of the national five standards
Pearl River Delta
Since March 1 day, 2005, light-duty ignition engine vehicles sold, registered and transferred in the Pearl River Delta region shall meet the emission control requirements in the national emission standard "Emission Limits and Measurement Methods for Pollutants of Light Vehicles (China Phase V)" (GB18352.5-2013), and the standards shall be implemented.
At the same time, stop selling, registering and transferring vehicles that do not meet the above requirements.
Since July 1 2005, the light-duty ignition engine vehicles sold, registered and transferred in the eastern and western regions of Guangdong Province should meet the emission control requirements in the national emission standard "Emission Limits and Measurement Methods for Pollutants of Light Vehicles (China Phase V)" (GB18352.5-2013).
At the same time, stop selling, registering and transferring vehicles that do not meet the above requirements.
Since July 1 2005, the heavy-duty compression-ignition engines for public transportation, sanitation and postal services sold, registered and transferred in the Pearl River Delta region should meet the national emission standard "Emission limits and measurement methods of automotive compression-ignition engines and automobile exhaust pollutants (China III, IV and V stages)" (GB 1769655)
At the same time, stop selling, registering and transferring vehicles that do not meet the above requirements.
Since the official implementation of the above standards, the traffic administrative department of the public security organ shall not handle the registration procedures for new cars that do not meet the requirements of this circular, for change registration and transfer registration in different places.
Baidu Encyclopedia-National Fifth Stage Vehicle Pollutant Emission Standard