Mass decontamination
Mass decontamination (abbreviated mass decon) is the decontamination of large numbers of people, in the event of industrial, accidental, or intentional contamination by toxic, infective, caustic, polluted, or otherwise unhealthful or damaging substances. == Mass hysteria and security aspects == Scenes of mass contamination are often scenes of collective hysteria, with hundreds or thousands of victims in a state of panic.