How deep particles penetrate the airways depends on a number of factors including the particle size, rate of breathing and velocity of inhaled air.
Physical exercise increases the rate of breathing and the velocity of inhaled air. Consequently, particulate matter is transported deep into the smallest airways where it gets deposited in regions that have poor expulsion mechanisms such as mucociliary movements. This enhances local toxic injury of the airway mucosal cells in addition to systemic effects upon their absorption from the alveoli into the pulmonary capillaries.
It is because of this danger that people should exercise in areas with . . .
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