Bronchitis is inflammation or swelling of the bronchial tubes (bronchi), the air passages between the nose and the lungs. More specifically, bronchitis is when the lining of the bronchial tubes becomes inflamed or infected.Bronchitis is caused by viruses, bacteria, and other particles that irritate the bronchial tubes. E
xposure to tobacco smoke, exposure to pollutants or solvents, and gastroesophageal reflux disease (
GERD) can also cause acute bronchitis.
Air pollution, dust, toxic gases, and other industrial fumes are known to be responsible for the condition.