GasVaporMistFumesDustSmokeSmogRefer to your own national regulations.Type* 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.GasLiquidSolidFormIn accordance with NIOSH * regulationsGases 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.De■nitionAmmonia, hydrogen sul■de, chlorineOrganic vaporsAcid mist, oil mist, spray mistWelding fumes, metal fumesDust by crushed stone and drillingCigarette smoke, funnel smokePolluted air (exhaust gas)ExampleNO or UNKNOWN YESNO or UNKNOWN Selection of Respiratory Protective DevicesForm of ContaminantsSelection of Respiratory Protective DevicesIs the oxygen concentration more than 19.5 % ? (NORMAL 21 %)Is the type of contaminants known ?Selection Flow Chart of Respiratory Protective Devices
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