This is accomplished by supplying air that has the right mixture of oxygen and inert gases and is free of contaminants. An alternate approach is to clean the air before it is inhaled into the lungs. If there are particulates present, it may be possible to filter them from inhaled air. If there are undesired gases, it may be possible to adsorb them or chemically capture them before they are inhaled. The method selected depends on the degree of danger and potential failure of the equipment.
Many industrial operations generate airborne contaminants.
Typical industrial operations that generate airborne hazards include metal casting, grinding, welding, polishing and spray finishing. OSHA requires different level of respiratory protection for different industrial applications. OSHA requirements for respiratory protection are included in 29CFR1910.134. The primary means to control occupational diseases caused by breathing contaminated air is through the use of feasible engineering controls, such as enclosures, confinement of operations, ventilation, or substitution of less toxic materials. Employer must provide respirators, when necessary, which are applicable and suitable for the purpose intended.