â— National II
   From July 1, 2004, the second phase of the National Vehicle Pollutant Emission Standard (Gbl8352.2, referred to as the National 2 Standard), which is equivalent to the European No. 2 Standard, has been implemented nationwide. All new fixed-type light vehicles must comply with Standard requirements, and stop reporting and approval of light vehicles that meet the first phase of the National Vehicle Pollutant Emission Standard (equivalent to the European Standard No. 1 or simply No. 1 Standard).
The so-called National II standard means that the emission limits for carbon monoxide and hydrocarbons, nitrogen oxides and particulate matter are 2.2 g/km and 0.5 g/km.
â— Country IIIThe so-called "National III Standard" refers to the third-phase limit of the national vehicle pollutant discharge standard (GB18352.3-2005, hereinafter referred to as the National III standard). According to reports, China's "National III Standard" is equivalent to the European III standard, and vehicles that meet the "National III Standard" can significantly reduce the pollutant emissions of bicycles, and its total discharge of pollutants to the "National II standard" vehicles About 40% reduction.
The so-called National III standard refers to gasoline vehicles: HC: 0.66%; CO: 2.1%; NOx: 5%; PM: 0.1%. Diesel vehicles: HC+NOx: 0.56%; CO: 0.64%; PM: 0.05%.
◠National IV standard   The National IV emission standard is the national fourth-phase vehicle pollutant discharge standard. The vehicle emission pollutants mainly include HC (hydrocarbon), NOx (nitrogen oxide), CO (carbon monoxide), PM (particles), etc. The application of technologies such as active layers of good catalytic converters, secondary air injection, and exhaust gas recirculation systems with cooling devices controls and reduces the standards for emissions of pollutants from cars to below specified values.
The National IV standard is called "National Phase IV Motor Vehicle Emission Standard" and it is equivalent to the European "Euro IV Standard". In terms of emission control, the National IV standard motor vehicles need to further reduce 30%-50% of pollutants on the basis of State III to achieve compliance. At present, only Beijing, Shanghai, and the Pearl River Delta region in the Mainland have explicitly implemented the standard. In the future, the national IV standards will be implemented one after another. Research shows that an automobile pollutant that meets the national IV standard can be reduced by 50% compared with the same type III country standard. At the same time, the use of National IV vehicles in conjunction with National IV oil will reduce the total amount of pollutants emitted by the entire Pearl River Delta motor vehicle by 15%-20%.
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