Throughout Part 1910, OSHA requires employers to communicate effectively with their employees. When a hazard is present, employees must be made aware of it.

Facial deformities and facial hair, where the respirator forms a seal to the face; 2. Perforated tympanic membranes; 3. Respiratory diseases affecting pulmonary function; 4. Symptomatic coronary artery disease, significant arrhythmias, or history of recent myocardial infarction; 5.

If employers allow the voluntary use of elastomeric facepiece and powered air-purifying respirators (after determining that such use will not itself create a hazard), the employer must implement the elements of a written respiratory protection program necessary to ensure that employees voluntarily using such ...

29 CFR 1910.134 Appendix D Sometimes, workers may wear respirators to avoid exposures to hazards, even if the amount of hazardous substance does not exceed the limits set by OSHA standards.