considered hazardous by OSHA https://www.osha.gov/SLTC/toluene/exposure_limits.html OSHA Toluene exposure limits by industry OSHA Toluene exposure limits by industry Exposure Limits https://www.osha.gov/SLTC/toluene/exposure_limits.html https://www.osha.gov/SLTC/toluene/exposure_limits.html