Chlorine is classified as which type of chemical agent?

• A. Blood
• B. Nerve
• C. Choking/Pulmonary
• D. Blister

Answer: (C)

Choking/pulmonary agents are defined by their primary impact on the respiratory system, causing airway irritation, coughing, and impaired gas exchange that can lead to asphyxia or fluid buildup in the lungs. Chlorine gas fits this pattern because, when inhaled, it irritates the nose, throat, and lungs. In the lungs, chlorine reacts with water to form acids that damage airway and alveolar tissues, producing coughing, chest tightness, and, at higher exposures, pulmonary edema. This respiratory-focused effect is what makes chlorine a choking/pulmonary agent.

Nerve agents disrupt the nervous system, leading to rapid, life-threatening cholinergic symptoms; blood agents interfere with cellular respiration at the mitochondrial level; blister agents cause skin and mucous membrane blistering. These effects do not describe chlorine’s main action, which is to injure the lungs and airways rather than primarily affecting nerves, blood chemistry, or skin.