| Organization | Standard | Reference | 
|---|
| Mine Safety and Health Administration (MSHA) STANDARD-air | time-weighted average 0.1 ppm (0.7 mg/m3) | DTLVS* 3,27,1971 | 
| 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 0.1 ppm (0.72 mg/m3), JUL2008 |  | 
| Occupational Exposure Limit-AUSTRALIA | time-weighted average 2.5 mg(F)/m3, JUL2008 |  | 
| Occupational Exposure Limit-AUSTRIA | MAK-TMW 0.1 ppm (0.7 mg/m3), 2007 |  | 
| Occupational Exposure Limit-BELGIUM | time-weighted average 0.1 ppm (0.73 mg/m3), MAR2002 |  | 
| Occupational Exposure Limit-BELGIUM | time-weighted average 2.5 mg(F)/m3, MAR2002 |  | 
| Occupational Exposure Limit-DENMARK | time-weighted average 0.1 ppm (0.7 mg/m3), MAY2011 |  | 
| Occupational Exposure Limit-EC | time-weighted average 2.5 mg(F)/m3, JUN2000 |  | 
| Occupational Exposure Limit-FINLAND | short term exposure limit 0.1 ppm (0.7 mg/m3), NOV2011 |  | 
| Occupational Exposure Limit-FINLAND | time-weighted average 2.5 mg(F)/m3, NOV2011 |  | 
| Occupational Exposure Limit-FRANCE | VME 0.1 ppm (0.7 mg/m3), FEB2006 |  | 
| Occupational Exposure Limit-GERMANY | MAK 1 mg(F)/m3, inhal, 2011 |  | 
| Occupational Exposure Limit-HUNGARY | time-weighted average 2.5 mg(F)/m3, short term exposure limit 10 mg(F)/m3, Skin, SEP2000 |  | 
| Occupational Exposure Limit-ICELAND | time-weighted average 0.1 ppm (0.7 mg/m3), NOV2011 |  | 
| Occupational Exposure Limit-KOREA | time-weighted average 0.1 ppm (0.7 mg/m3), 2006 |  | 
| Occupational Exposure Limit-MEXICO | time-weighted average 0.1 ppm (0.7 mg/m3);short term exposure limit 0.3 ppm (2 mg/m3), 2004 |  | 
| Occupational Exposure Limit-MEXICO | time-weighted average 2.5 mg(F)/m3, 2004 |  | 
| Occupational Exposure Limit-NEW ZEALAND | time-weighted average 0.1 ppm (0.72 mg/m3), JAN2002 |  | 
| Occupational Exposure Limit-NEW ZEALAND | time-weighted average 2.5 mg(F)/m3, JAN2002 |  | 
| Occupational Exposure Limit-NORWAY | time-weighted average 0.6 mg(F)/m3, JAN1999 |  | 
| Occupational Exposure Limit-PERU | time-weighted average 0,1 ppm (0,72 mg/m3), JUL2005 |  | 
| Occupational Exposure Limit-SWEDEN | time-weighted average 2 mg(F)/m3, JUN2005 |  | 
| Occupational Exposure Limit-SWITZERLAND | MAK-week 0.1 ppm (0.7 mg/m3), JAN2011 |  | 
| Occupational Exposure Limit-SWITZERLAND | MAK-week 1 mg(F)/m3, KZG-week 4 mg(F)/m3, inhal, skin, JAN2011 |  | 
| Occupational Exposure Limit-THE NETHERLANDS | MAC-TGG 0.7 mg/m3, 2003 |  | 
| Occupational Exposure Limit-UNITED KINGDOM | time-weighted average 2.5 mg(F)/m3, OCT2007 |  | 
| Occupational Safety and Health Administration (OSHA) Permissible Exposure Limit (Construction) | 8H time-weighted average 2.5 mg(F)/m3 | CFRGBR 29,1926.55,1994 | 
| Occupational Safety and Health Administration (OSHA) Permissible Exposure Limit (Construction) | 8H time-weighted average 0.1 ppm (0.7 mg/m3) | CFRGBR 29,1926.55,1994 | 
| Occupational Safety and Health Administration (OSHA) Permissible Exposure Limit (Federal Contractors) | 8H time-weighted average 2.5 mg(F)/m3 | CFRGBR 41,50-204.50,1994 | 
| Occupational Safety and Health Administration (OSHA) Permissible Exposure Limit (General Industry) | 8H time-weighted average 2.5 mg(F)/m3 | CFRGBR 29,1910.1000,1994 | 
| Occupational Safety and Health Administration (OSHA) Permissible Exposure Limit (Shipyards) | 8H time-weighted average 0.1 ppm (0.7 mg/m3) | CFRGBR 29,1915.1000,1993 |