Groups comparison

Gas hazards(Aerosol hazards) - 2003 to 2016
Includes areas where dangerous gases are present, whether these cause direct damage, asphyxiation, poisoning, or some other effects. This also includes aerosols, spores, and other similar and similarly dealt with hazards.

Gas mask (Rebreather;Breathing apparatus) - 2003 to 2017
Includes any device that protects the user from airborne toxins and other pollutants, whether it's in form of a mask or not.

gashazards
gasmask
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