Vehicle emission standards refer to a set of specifically established regulatory standards aimed at controlling the pollutants emitted by vehicles. Most countries around the world have formulated corresponding emission standards. China, drawing from European vehicle emission standards, has established its own national standards. The primary pollutants emitted by vehicles include carbon monoxide (CO), hydrocarbons (HC), nitrogen oxides, and particulate matter (PM), all of which are environmental contaminants that need to be controlled. The sources of vehicle pollutants come from the exhaust pipe, crankcase, and fuel system. To curb the generation of these harmful gases and encourage automobile manufacturers to improve their products, vehicle emission standards are continuously supplemented, refined, and tightened as the number of vehicles increases and environmental conditions worsen. China began implementing the China 6 standard from July 1, 2020. Compared to the China 5 emission standard, the China 6 standard reduces carbon monoxide emissions from gasoline vehicles by 50%, lowers the emission limits for total hydrocarbons and non-methane hydrocarbons by 50%, and tightens the nitrogen oxides emission limit by 42%. These emission standards have now comprehensively surpassed European emission standards. Vehicle owners can check whether their vehicle complies with the China 6 standard through the factory certificate and the vehicle environmental protection information list, or they can log in to the Motor Vehicle Environmental Protection Website to inquire about relevant information.
