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...ethylene is known to be associated with dizziness, confusion, headache, nausea and irritation of the eyes and mucous tissues in people who are exposed to concentrations of 200 parts per million (ppm) =-=[10]-=-. Exposure to higher levels of PERC (more than 1500 ppm) may lead to unconsciousness and death from respiratory depression[10]. Therefore jurisdictions impose permissible exposure limits for different...