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abrasive air movement air-supplied oxygen alveoli asbestos dust atmosphere blood vessels Body Defenses breathing bronchi bronchioles Bureau of Mines carbon dioxide cause cells centration cilia and phagocytes circulation collector complicating infection contracting lungs cubic feet cubic foot Drinker and Hatch duct dust disease dust explosions dust may vary dust particles dust per cubic dust prevention dust-producing dust-tight Dusty materials dusty processes dusty trades economic effective dust efficient elimination employees Enclose sources equipment Explosive Dusts exposure feces fibrosis fibrous harmful hazard human body industrial dusts Information Circular 6989 ingest inhaled dust INJURIOUS DUSTS irritant kidneys LABOR liver Locate hood lymph Mines Information Circular Normal Functions occupational disease oxidation oxygen-laden ployees Portals of Entry practices production quartz reach the lungs RESPIRATION saccules scar tissue sibilities silica and asbestos silicosis skin surface talc tion toxic dusts trachea tracheobronchial U. S. Bureau ume of air uncontrolled dusts workers