A NIOSH recommended exposure limit, or REL, is the work-place exposure
concentration recommended by NIOSH for promulgation by OSHA as a PEL. In some
cases, NIOSH has described time-weighted average concentrations in terms of 10-
hour, rather than 8-hour, averages.
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Recommended Exposure Limit
,A condition called chloracne may be caused by repeated exposures to PCB's
(polychlorinated biphenyls) and other chlorinated hydrocarbons.
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Skin
A chemical that is toxic has an LD50 (lethal dose 50%) of more than 50
milligrams/kilogram but less than 500 mg/kg of chemical per 1 kilogram of body
weight administered orally; LD50 of more than 200 milligrams per kilogram of body
weight but less than 1000 mg/kg when administered by continuous skin contact for 24
hours; LC50 (lethal concentration 50%) in air of more than 200 ppm by volume but
less than 2000 when administered by continuous inhalation for one hour or less; or
more than 2 mg/kg per liter but less than 20 mg/kg of mist, dust, or fume when
continuously inhaled for one hour or less.
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Toxic
IDLH exposure concentrations have been established by the NIOSH/OSHA
Standards Completion Program (SCP) as a guideline for selecting respirators for some
chemicals. The definition of IDLH varies depending on the source.
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Immediately Dangerous to life and health
, Neurotoxins are chemicals that affect the brain and spinal cord.
Neurotoxins affect the neurons that carry electrical signals by inhibiting their function.
This can cause behavior changes, emotional changes, alterations in walking, and loss
of hand-eye coordination.
A condition called anoxia may occur, due to a lack of oxygen flow to the brain cells.
Lack of oxygen results in cell death.
Examples of chemicals causing central nervous system effects are tetraethyl lead,
chlorinated hydrocarbon pesticides (e.g., DDT), malathion, lead, and mercury.
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Central Nervous System
You must know the potential for toxicity of the materials that you work with to
adequately protect yourself from toxic exposure. Once the presence and the
concentrations of specific chemicals or classes of chemicals have been established,
the associated hazards should be determined.
Information on the chemical, physical, and toxicological properties of each chemical
should be recorded on a Hazardous Substance Information Form. Health and safety
personnel should then make the necessary information available in one place. New
personnel should be briefed.
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Protect Yourself
concentration recommended by NIOSH for promulgation by OSHA as a PEL. In some
cases, NIOSH has described time-weighted average concentrations in terms of 10-
hour, rather than 8-hour, averages.
Give this one a try later!
Recommended Exposure Limit
,A condition called chloracne may be caused by repeated exposures to PCB's
(polychlorinated biphenyls) and other chlorinated hydrocarbons.
Give this one a try later!
Skin
A chemical that is toxic has an LD50 (lethal dose 50%) of more than 50
milligrams/kilogram but less than 500 mg/kg of chemical per 1 kilogram of body
weight administered orally; LD50 of more than 200 milligrams per kilogram of body
weight but less than 1000 mg/kg when administered by continuous skin contact for 24
hours; LC50 (lethal concentration 50%) in air of more than 200 ppm by volume but
less than 2000 when administered by continuous inhalation for one hour or less; or
more than 2 mg/kg per liter but less than 20 mg/kg of mist, dust, or fume when
continuously inhaled for one hour or less.
Give this one a try later!
Toxic
IDLH exposure concentrations have been established by the NIOSH/OSHA
Standards Completion Program (SCP) as a guideline for selecting respirators for some
chemicals. The definition of IDLH varies depending on the source.
Give this one a try later!
Immediately Dangerous to life and health
, Neurotoxins are chemicals that affect the brain and spinal cord.
Neurotoxins affect the neurons that carry electrical signals by inhibiting their function.
This can cause behavior changes, emotional changes, alterations in walking, and loss
of hand-eye coordination.
A condition called anoxia may occur, due to a lack of oxygen flow to the brain cells.
Lack of oxygen results in cell death.
Examples of chemicals causing central nervous system effects are tetraethyl lead,
chlorinated hydrocarbon pesticides (e.g., DDT), malathion, lead, and mercury.
Give this one a try later!
Central Nervous System
You must know the potential for toxicity of the materials that you work with to
adequately protect yourself from toxic exposure. Once the presence and the
concentrations of specific chemicals or classes of chemicals have been established,
the associated hazards should be determined.
Information on the chemical, physical, and toxicological properties of each chemical
should be recorded on a Hazardous Substance Information Form. Health and safety
personnel should then make the necessary information available in one place. New
personnel should be briefed.
Give this one a try later!
Protect Yourself
