To provide a method of scavenging active oxygen species harmful to a living body present in a gas phase such as cigarette smoke, and to provide a scavenging formulation of the active oxygen species.

This method of scavenging active oxygen species in a gas phase includes a step of bringing solid substance to which cyclic nitroxyl radical is immobilized into contact with active oxygen species present in the gas phase. The scavenging formulation of active oxygen species present in a gas phase is used, which includes, as active ingredient, the solid substance to which cyclic nitroxyl radical is immobilized.