Bayanin samfurin:

A ƙarƙashin ƙayyadaddun yanayin gwaji, ƙananan ƙonewar halin yanzu na gas, ƙwayoyin fashewa na tururi da ƙananan ƙonewar halin yanzu na ƙwayoyin fashewa na methane. Kasar Sin ta tsara gas, tururi haɗari abubuwa bisa ga kananan ƙonewa halin yanzu rabo zuwa IIA mataki, IIB mataki da IIC mataki. Kadan ƙonewa halin yanzu rabo ≤1.0, > 0.8 ne IIA matakin; ≤0.8, > 0.45 ne IIB aji; ≤0.45 ne IIC aji. Misali, ethane, ethylene, acetylene ne IIA Class, IIB Class, IIC Class masu haɗari.