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.