title: Performance measurements on a powered air-purifying respirator made during actual field use in a silica bagging operation.
mesh_terms: D004391:Dust; D005069:Evaluation Studies as Topic; D006801:Humans; D011482:Protective Devices; D012134:Respiratory Protective Devices; D012822:Silicon Dioxide
chemical_list: D004391:Dust; D012822:Silicon Dioxide