1February, 2026(2026.2)Is the oxygen concentration more than 19.5 % ? (NORMAL 21 %)Selection of Respiratory Protective DevicesSelection of Respiratory Protective DevicesIs the type of contaminants known ?NO or UNKNOWN YESNO or UNKNOWN * NIOSH : National Institute for Occupational Safety and Health (USA)*Be sure to check the oxygen concentration and concentration of contaminants so as to select respiratory protective equipment that is suitable to the contamination conditions of the air in the working environment.The oxygen concentration in the Selection Flow Chart meets NIOSH * regulations.Refer to your own national regulations.Ammonia, hydrogen sulfide, chlorineOrganic vaporsAcid mist, oil mist, spray mistWelding fumes, metal fumesDust by crushed stone and drillingCigarette smoke, funnel smokePolluted air (exhaust gas)GasLiquidIn accordance with NIOSH * regulationsSolidGases are gaseous substances at room temperature and atmospheric pressure (25 ˚C, 1 atm.).Liquid or solid substances that sublimate at room temperature and atmospheric pressure (25 ˚C, 1 atm.).Liquid particles suspended in an atmosphere.Fumes are solid particles formed by condensation of vaporized solid materials under high temperature.Small solid particles produced when solid bodies are crushed without any change in chemical composition.Airborne particles, liquid particles or gaseous matter produced by combustion, heat decomposition or chemical reaction of organic substances. Dust or funnel smoke that has combined with moisture to become mist.ExampleDefinition FormTypeGasVaporMistFumesDustSmokeSmogForm of ContaminantsSelection Flow Chart of Respiratory Protective Devices
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