Immediately Dangerous To Life or Health (IDLH) Values

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