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INTRODUCTION TO OCCUPATIONAL HEALTH |
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Threshold Limit Values |
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The data for establishing TLVs come from
animal studies, human studies, and industrial experience, and the limit may be selected
for several reasons. It may be based on the fact that a substance is very irritating to
the majority of people exposed, or, other substances may be asphyxiants. Still other reasons for establishing a TLV include the fact that certain chemical compounds are anesthetic, or fibrogenic, or can cause allergic reactions or malignancies. Some additional TLVs have been established because exposure above a certain airborne concentration is a nuisance. The basic idea of TLVs is fairly simple. They refer to airborne concentrations of substances and represent conditions under which it is believed that nearly all workers may be repeatedly exposed, day after day, without adverse effect. |
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