CDC - Immediately Dangerous to Life or Health Concentrations (IDLH): Chlorine dioxide - NIOSH Publications and Products
{OSHA CURRENT LIMITS} NIOSH REL: 0.1 ppm (0.3 mg/m3) TWA, 0.3 ppm (0.9 mg/m3) STEL. Current OSHA PEL: 0.1 ppm (0.3 mg/m3) TWA. 1989 OSHA PEL: 0.1 ppm (0.3 mg/m3) TWA, 0.3 ppm (0.9 mg/m3) STEL. 1993-1994 ACGIH TLV: 0.1 ppm (0.28 mg/m3) TWA, 0.3 ppm (0.83 mg/m3) STEL