What is the main reason sulfur dioxide irritates the upper respiratory mucous membrane?
It dissolves in moisture in upper respiratory tract and forms irritant
Sulphur dioxide (SO₂) is a major air pollutant released by burning fossil fuels and industrial processes.
When SO₂ contacts the moist lining of the respiratory tract, it dissolves to form sulphurous acid (H₂SO₃):
SO₂ + H₂O → H₂SO₃
This acid irritates and inflames the mucous membranes of the nose, throat, bronchi, and lungs, causing coughing, wheezing, and aggravating conditions like asthma and bronchitis.
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