Respiratory hazards are invisible and can have severe impact on the health and safety of a worker. A respiratory hazard can be a particulate, gas or vapor, and include airborne contaminants, biological contaminants, dusts, mists, fumes, and gases, or oxygen-deficient atmospheres. Some respiratory health problems have long-term consequences and dramatically reduce quality of living due to difficulty-breathing.

Personal Protective Equipment (PPE), such as respirators, are equipment worn by workers to minimize exposure to the occupational hazards of chemical, biological and other airborne substances. A hazard cannot be eliminated by the PPE, but the risk of injury can be reduced.

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