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Unlike other types of hazards, airborne contaminants are often invisible because of their size or nature.
You may not be able to see, feel or even smell them. An airborne contaminant is any type of material or
gas that does not normally occur in the atmosphere.
Preventing airborne contaminants from entering the workplace and providing adequate ventilation are
the first steps that should be taken. Sometimes this is not possible and respiratory protective equipment
must be worn.
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Source: Air Purifying Respirators - Safety Talk PDF (PDF) Document, PA Services Group
