Industrial Hygiene Exposure Assessment: The Good, Bad, and
Industrial Hygiene Exposure Assessment: The Good, Bad, and
Industrial Hygiene Exposure Assessment: The Good, Bad, and
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<strong>The</strong> AIHA Model<br />
<strong>Exposure</strong> Control<br />
Ratings *<br />
Cutoff (%OEL)<br />
1 < X 0.95 < 10%<br />
� AIHA 2 <strong>Exposure</strong> 10% Control < X Ratings for TWA<br />
0.95 < 50%<br />
OELs<br />
3 50% < X0.95 < 100%<br />
� Which control zone is appropriate?<br />
4 X 0.95 > 100%<br />
Confidence level<br />
High<br />
Medium<br />
Low