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During normal respiration, air travels through the nose, down the trachea, and into smaller and smaller airways called bronchi. The bronchi divide into bronchioles and finally into tiny grape-like clusters of thin, fragile sacs called alveoli.

People who work in mines or quarries, or who work with materials such as insulation or fireproofing, are at increased risk for inhaling small particles of asbestos dust. The tiny asbestos particles travel through the smallest airways into the alveolar ... more