Immediately Dangerous To Life or Health (IDLH) Values
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NOTE: This page is archived for historical purposes and is no longer being maintained or updated.
May 1994
Immediately Dangerous to Life or Health Concentrations (IDLH)
| A1 | confirmed human carcinogen (ACGIH) |
| A2 | suspected human carcinogen (ACGIH) |
| A3 | animal carcinogen (ACGIH) |
| A4 | not classifiable as a human carcinogen (ACGIH) |
| A5 | not suspected as a human carcinogen (ACGIH) |
| ACGIH | American Conference of Governmental Industrial Hygienists |
| AIHA | American Industrial Hygiene Association |
| CAS | Chemical Abstract Service |
| CF | correction factor for LC data |
| CFR | Code of Federal Regulations |
| EEGL | emergency exposure guidance level (NRC) |
| ERPG | emergency response planning guideline (AIHA) |
| IDLH | immediately dangerous to life or health concentration value |
| i.p. | intraperitoneal |
| i.v. | intravenous |
| kg | kilogram |
| LC | lethal concentration |
| LC50 | concentration causing death in 50% |
| LCLo | lowest concentration causing death |
| LD | lethal dose |
| LD50 | dosage causing death in 50% |
| LDLo | lowest dosage causing death |
| LEL | lower explosive limit |
| mg/kg | milligrams per kilogram of body weight |
| mg/m3 | milligrams per cubic meter of air |
| mmHg | millimeters of mercury (pressure measurement) |
| mppcf | millions of particles per cubic foot of air |
| NIOSH | National Institute for Occupational Safety and Health |
| NRC | National Research Council |
| OSHA | Occupational Safety and Health Administration |
| PEL | permissible exposure limit (OSHA) |
| ppm | parts per million parts of air |
| RD50 | concentration producing a 50% decrease in respiratory rate following a 10-minute exposure |
| REL | recommended exposure limit (NIOSH) |
| s.c. | subcutaneous |
| SCP | Standards Completion Program (NIOSH/OSHA) |
| SPEGL | short-term public emergency guidance level (NRC) |
| STEL | Short-term exposure limit |
| TCLo | lowest concentration resulting in a toxic effect |
| TDLo | lowest dose resulting in a toxic effect |
| TLV | threshold limit value (ACGIH) |
| TWA | time-weighted average |
- Page last reviewed: December 4, 2014 (archived document)
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