Phosgene (CG) and chlorine (CL) are lung-damaging agents. They are the first chemical warfare agents (CWA) used and are also classified as TICs. They are shipped via rail cars and tanker trucks daily throughout the United States. Phosgene and chlorine cause irritation of the bronchi, trachea, larynx, pharynx, and nose, and may contribute to the sensation of choking. Initial symptoms include eye irritation, burning, pulmonary irritation, running nose (rhinorrhea), cough, dyspnea, chest tightness, reddening of the skin (erythema), and lung damage (pulmonary edema).

Decontaminate (remove clothing and wash your entire body with soap and water) and do not exert yourself if you have been exposed to one of these agents.