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- What is Environmental Toxicology?Chemical Use of PPM The OSHA 8-hour HCN limit is at 10.0 ppm. According to the Merck Index, 300 mg/kg of air at room temperature is the lethal dose of HCN in air. In what mg HCN/kg air is 10.0 ppm present? What percentage of a dose is 10.0 ppm?why You won’t feel so incredible after being exposed to hazardous chemicals?
