The following HTML text is provided to enhance online
readability. Many aspects of typography translate only awkwardly to HTML.
Please use the page image
as the authoritative form to ensure accuracy.
Acute Exposure Guideline Levels for Selected Airborne Chemicals: Volume 9
10 min
30 min
1 h
4 h
8 h
1,300 ppm
1,300 ppm
870 ppm
390 ppm
260 ppm
irritation is no longer considered mild; the concentration represents the threshold for lethality. The 10-min value was set equal to the 30-min value because of the uncertainty in extrapolating from the exposure duration of 4 h to 10 min.
Data Adequacy: Data were adequate for derivation of an AEGL-3. The resulting values were supported by dog data (similar no-effect level of mortality in a nonobligate nose breather; Jacobson et al. 1956); monkey data, 300 ppm 6 h/day for 2 years not lethal (Sprinz et al. 1982; Lynch et al. 1983; Setzer et al. 1997); 457 ppm for 7 h/day for 154 days not lethal (Rowe et al. 1956); and human data (exposure to 1,520 ppm for 171 min not lethal) (CMA 1998).
