One of the human health effects of sulfur dioxide is:

a. Carboxyhemoglobin formation

b. Bronchoconstriction

c. Lung cancer

d. Brain/CNS damage

Bronchoconstriction

Explanation:

Bronchoconstriction may be defined as the medical condition in which the airways of the lungs get constricted because of hardening of smooth muscle. The symptoms included are wheezing, coughing and breath shortness.

The main cause of bronchoconstriction is the effect of inhalation of sulfur dioxide in the lungs. The sulfur dioxide causes the hardening of smooth muscle of the lungs and may also effect the eyes.

Thus, the correct answer is option (b).