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The vacuum effect created by the active hood will dissipate any hazardous fumes from the lab environment . Inhalation of spray mist can be hazardous . In the course of UMDNJ ’ s operations , hazardous wastes and materials are sometimes generated . If a cancer cluster and hazardous levels of an environmental contaminant coexist , removal of the health hazard seems prudent , regardless of its role in causing cancer . There is a growing consensus in favour of banning the transboundary movement and disposal of hazardous wastes in all countries .