79. Due to increasing air-borne allergens and pollutants, many people in urban areas are suffering from respiratory disorder causing wheezing due to : (1) benign growth on mucous lining of nasal cavity. (2) inflammation of bronchi and bronchioles. (3) proliferation of fibrous tissues and damage of the alveolar walls. (4) reduction in the secretion of surfactants by pneumocytes.
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When there is difficulty inbreathing, the condition is called asthma. It causes wheezing due to the inflammation of bronchioles. The allergens and pollutants enter the nasal cavity and cause allergic reactions. Due to more pollution in the urban areas, respiratory disorders are more common there.
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