| PAHs | Exposure limit |  |
---|
OSHA | CTPVs | 0.2Â mg/m3 | PEL TWA |
 | COEs | 0.15 mg/m3 | PEL TWA |
NIOSH | CTPVs | 0.2Â mg/m3 | REL TWA |
ACGIH | CTPVs | 0.2Â mg/m3 | TLV TWA |
MOEL (Korea) | CTPVs | 0.2Â mg/m3 | TWA |
 | Naphthalene | 50 mg/m3 | TWA |
 |  | 75 mg/m3 | STEL |
- OSHA Occupational Safety and Health Administration; NIOSH National Institute for Occupational Safety and Health; ACGIH American Conference of Governmental Industrial Hygienist; MOEL Ministry of Employment and Labor; CTPVs Coal tar pitch volatiles; COEs Coke oven emissions; PEL Permissible exposure limits; TWA 8Â h time-weighted average; TLV Threshold limit value; STEL Short-term exposure limits