| Organization | Standard | Reference |
|---|
| Mine Safety and Health Administration (MSHA) STANDARD-air | time-weighted average 2 ppm (12 mg/m3) | DTLVS* 3,9,1971 |
| Occupational Exposure Limit IN ARGENTINA, BULGARIA, COLOMBIA, JORDAN check ACGIH TLV; | | |
| Occupational Exposure Limit IN SINGAPORE, VIETNAM check ACGIH TLV | | |
| Occupational Exposure Limit-AUSTRALIA | time-weighted average 2 ppm (12 mg/m3), short term exposure limit 3 ppm (18 mg/m3), JUL2008 | |
| Occupational Exposure Limit-AUSTRIA | MAK-TMW 2 ppm (12 mg/m3), 2007 | |
| Occupational Exposure Limit-BELGIUM | time-weighted average 2 ppm (12 mg/m3), short term exposure limit 3 ppm (18 mg/m3), MAR2002 | |
| Occupational Exposure Limit-DENMARK | time-weighted average 2 ppm (12 mg/m3), MAY2011 | |
| Occupational Exposure Limit-FINLAND | time-weighted average 2 ppm (12 mg/m3), short term exposure limit 4 ppm (25 mg/m3), NOV2011 | |
| Occupational Exposure Limit-FRANCE | VME 2 ppm (12 mg/m3), FEB2006 | |
| Occupational Exposure Limit-GERMANY | MAK 2 ppm (12 mg/m3), 2011 | |
| Occupational Exposure Limit-ICELAND | time-weighted average 2 ppm (12 mg/m3), NOV2011 | |
| Occupational Exposure Limit-KOREA | time-weighted average 2 ppm (12 mg/m3), short term exposure limit 3 ppm (18 mg/m3), 2006 | |
| Occupational Exposure Limit-MEXICO | time-weighted average 2 ppm (12 mg/m3);short term exposure limit 3 ppm (18 mg/m3), 2004 | |
| Occupational Exposure Limit-NEW ZEALAND | time-weighted average 2 ppm (12 mg/m3); short term exposure limit 3 ppm (18 mg/m3), JAN2002 | |
| Occupational Exposure Limit-NORWAY | time-weighted average 2 ppm (12 mg/m3), JAN1999 | |
| Occupational Exposure Limit-PERU | time-weighted average 2 ppm (12 mg/m3); short term exposure limit 3 ppm (18 mg/m3), JUL2005 | |
| Occupational Exposure Limit-SWITZERLAND | ceiling concentration 2 ppm (12 mg/m3), JAN2011 | |
| Occupational Exposure Limit-THE NETHERLANDS | MAC-TGG 12 mg/m3, 2003 | |
| Occupational Exposure Limit-TURKEY | time-weighted average 2 ppm (12 mg/m3), JAN1993 | |
| Occupational Safety and Health Administration (OSHA) Permissible Exposure Limit (Construction) | 8H time-weighted average 2 ppm (12 mg/m3) | CFRGBR 29,1926.55,1994 |
| Occupational Safety and Health Administration (OSHA) Permissible Exposure Limit (Federal Contractors) | 8H time-weighted average 2 ppm (12 mg/m3) | CFRGBR 41,50-204.50,1994 |
| Occupational Safety and Health Administration (OSHA) Permissible Exposure Limit (General Industry) | 8H time-weighted average 2 ppm (12 mg/m3) | CFRGBR 29,1910.1000,1994 |
| Occupational Safety and Health Administration (OSHA) Permissible Exposure Limit (Shipyards) | 8H time-weighted average 2 ppm (12 mg/m3) | CFRGBR 29,1915.1000,1993 |
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