Respiratory protection programs must be implemented whenever employees are exposed to airborne contaminants including dust, fumes, gases, and biological agents. The program must identify hazards requiring respiratory protection through air monitoring and risk assessment. Engineering controls and administrative practices must be used to reduce exposure before relying on respiratory protection. Respirators must be selected based on hazard type and concentration. Supplied air respirators and self-contained breathing apparatus (SCBA) provide the highest protection for severe hazards. Half-mask and full-face respirators with appropriate cartridges are acceptable for many construction hazards. Fit testing must be performed before initial use and annually thereafter to ensure proper seal and effectiveness. Employees must be trained on respirator selection, use, maintenance, and limitations. Users must understand that respirators reduce but do not eliminate exposure. Medical evaluation must determine fitness for respiratory protection before assignment. Employees with respiratory conditions may require special evaluation. Cartridges must be changed according to service life or when the user detects odor, taste, or visual signs of breakthrough. Storage in cool, dry conditions extends cartridge life. Respirators must be cleaned and maintained according to manufacturer instructions. Records of fit testing and training must be maintained. Inspections of respirators must occur regularly to identify damage.