The invention provides a system for manufacturing graphene wool which includes a receptacle, a graphene growth substrate locatable inside the receptacle, a heating device for increasing the temperature inside the receptacle, an inlet gas flow communication with the receptacle for controlling the introduction of gaseous substances into the receptacle, and a cooling device for rapidly decreasing the temperature inside the receptacle. The invention extends to a method for manufacturing graphene wool and to an air pollutant trap which includes: a sorbent, and a housing for housing the sorbent, wherein the sorbent includes graphene.