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A great deal of manual labor and construction jobs do require respiratory protection on account of how much dust and debris can accumulate during the course of the day.
Various particulates amass in work areas that can be extremely hazardous. Breathable respirators are designed to greatly reduce exposure and protect against low-oxygen environments, harmful dusts (such as asbestos), gases and vapors. These hazards are known to cause severe infirmities of which include: lung problems, additional long term respiratory illnesses, and cancer.