If a ceiling limit is not assigned for a chemical exposure, then a limit value can be calculated using the excursion factor based on the threshold limit value (TLV),
TLV in ppm
Excursion Factor
0 - 1
3
1 - 10
2
10 - 100
1.5
100 - 1000
1.25
maximum concentration permitted for a short exposure =
= (TLV in ppm) * (excursion factor)
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