From Wikipedia,
the free encyclopedia.
An IDLH, a situation
Immediately Dangerous to Life and
Health, defined by the
NIOSH as follows: "that poses
a threat of exposure to airborne
contaminants when that exposure is
likely to cause death or immediate
or delayed permanent adverse
health effects or prevent escape
from such an environment."
Examples include smoke or
poisonous gases.
IDLH values are often used for
the selection of breathing
apparatus that must be available
to workers or firefighters in a
given situation. However, they do
not technically include areas with
oxygen deficiency (below 19.5
percent) where breathing apparatus
is also required.
