Chlorine

CAS RN: 7782-50-5

Range of Toxicity

A) The range of toxicity depends on the concentration of chlorine gas, duration of exposure, water content of the tissues exposed, physical location of exposure (eg, enclosed space), and individual susceptibility. It has been estimated that at 1 to 3 parts per million (ppm) mild mucous membrane irritation can occur; 5 to 15 ppm will cause moderate irritation of the upper respiratory tract; and 30 ppm will produce immediate chest pain, vomiting, dyspnea, and cough. Exposure to concentrations of 35 to 51 ppm are lethal in 60 to 90 minutes, and 1000 ppm is lethal within a few minutes.
B) The OSHA time-weighted average permissible exposure limit (TWA PEL) is 1 ppm, and the NIOSH immediately dangerous to life and health (IDLH) level is 10 ppm.
C) One or two breaths of gas accumulating above swimming pool or spa chlorinator tablets may cause marked respiratory distress and hypoxemia.
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