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INTRODUCTION TO OCCUPATIONAL HEALTH |
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Threshold Limit Values |
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Because individual susceptibility varies widely, an occasional exposure of an
individual at (or even below) the threshold limit may cause discomfort, aggravation of a
preexisting condition, or occupational illness. In addition to the TLVs set for
chemical compounds, there are limits for physical agents, such as noise, microwaves, and
heat stress. Several important points should be noted concerning TLVs. First the term "TLV" is a copyrighted trademark of the ACGIH. It should not be used to refer to the values published in OSHA or other standards. OSHA's limits are known as permissible exposure limits (PELs) and will be discussed later. The ACGIH TLVs are not mandatory federal or state employee exposure standards. These limits are not fine lines between safe and dangerous concentrations nor are they a relative index of toxicity. |
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