Intuitively, you would think that an exposure limit such as the Threshold Limit Values (TLVs) from the American Conference of Governmental Industrial Hygienists (ACGIH) that are based on an 8-hour workday may not be protective for workers on a 12-hour shift. You would be right because there are two things that happen in this case.…
DetailsThe concept of Time Weighted Average (TWA) exposure limits is simple; it is a daily average concentration limit. The health concept is that if the exposure does not exceed this exposure limit, nearly all exposed workers will have no adverse effects. For the purpose of setting these limits, TWAs are usually defined as exposures for…
DetailsOccupational Exposure Limits (OELs) are limits established for occupational exposure to specific substances. These limits are determined by organizations tasked with safeguarding worker health, using a combination of toxicological and epidemiological data, and representing the maximum concentrations to which it is believed that most workers may be exposed in an occupational setting on a regular…
DetailsThis is like asking a computer user if they need a keyboard or a mouse. The answer, of course, is that both are important. Likewise, both qualitative and quantitative exposure assessment techniques are important in determining exposures to potential health hazards in the workplace. What is the difference between the two assessments? A qualitative assessment…
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