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The Threshold Limit Values

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Plog and Quinlan (2012) defines the Threshold Limit Values (TLV) as occupational exposure limits set by the American Conference of Governmental Industrial Hygienists. The Time Weighted Average TLV is an airborne concentration of a gas or particle to which most workers can be exposed on a daily basis for a working lifetime without adverse effect. According to Plog and Quinlan (2012) they state that each and every time an industrial hygienist works with a chemical, the industrial hygienist needs to understand the hazards posed by the chemical in order to perform a proper risk assessment. The industrial hygienist possibly will discover that the material is flammable, or explosive, or may react with common substances such as water or air. Another

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