What does China VI B gasoline mean?

[DiMicah]

China VI B gasoline means that some additives may be included in the gasoline, so that after combustion, the sulfur compounds and other pollutants generated can meet the China VI emission standards. China VI A standards stipulate: Gasoline vehicles must not emit more than 700 milligrams of carbon monoxide per kilometer driven; gasoline vehicles must not emit more than 68 milligrams of non-methane hydrocarbons per kilometer driven; gasoline vehicles must not emit more than 60 milligrams of nitrogen oxides per kilometer driven; gasoline vehicles must not emit more than 4.5 milligrams of PM fine particles per kilometer driven. China VI B standards stipulate: Gasoline vehicles must not emit more than 500 milligrams of carbon monoxide per kilometer driven; gasoline vehicles must not emit more than 35 milligrams of non-methane hydrocarbons per kilometer driven; gasoline vehicles must not emit more than 35 milligrams of nitrogen oxides per kilometer driven; gasoline vehicles must not emit more than 3 milligrams of PM fine particles per kilometer driven.