What do China 6a and China 6b mean?
1 Answers
China 6a and China 6b are emission limits for light-duty vehicles. The country has established two levels of requirements for the China 6a and China 6b stages. China 6a serves as a transitional phase between China 5 and China 6, while China 6b represents the true China 6 emission standard. The China 6 Motor Vehicle Pollutant Emission Standard is designed to prevent pollution from the exhaust of compression-ignition and gas-fueled spark-ignition engine vehicles, protect the ecological environment, and safeguard human health. The emission standards for the 'China 6a' stage are essentially the same as those for 'China 5,' but they adopt the strictest values from the 'China 5' emission requirements. For example: 'China 5' stipulates that carbon monoxide emissions from gasoline vehicles must not exceed 1g per kilometer, and diesel vehicles must not exceed 0.5g per kilometer. Under 'China 6a,' both types of vehicles must not exceed 0.5g of carbon monoxide emissions per kilometer.