| 10 min | 30 min | 60 min | 4 hr | 8 hr | |
|---|---|---|---|---|---|
| (ppm) 11/13/06 | |||||
| AEGL 1 | 670 | 670 | 670 | 670 | 670 |
| AEGL 2 | 6700* | 6700* | 5300* | 3400* | 2700* |
| AEGL 3 | 27,000*** | 27,000*** | 22,000*** | 14,000** | 6,800* |
Level of Distinct Odor Awareness (LOA) = 3.7ppm
Lower Explosive Limit (LEL) = 20,000ppm
* = >10% LEL; **>50% LEL; *** = > 100% LEL
For values denoted as * safety considerations against the hazard(s) of explosion(s) must be taken into account.
For values denoted as ** and *** extreme safety considerations against the hazard(s) of explosion(s) must be taken into account.
IMPORTANT NOTE: Interim AEGLs are established following review and consideration by the National Advisory Committee for AEGLs (NAC/AEGL) of public comments on Proposed AEGLs. Interim AEGLs are available for use by organizations while awaiting NRC/NAS peer review and publication of Final AEGLs. Changes to Interim values and Technical Support Documents may occur prior to publication of Final AEGL values. In some cases, revised Interim values may be posted on this Web site, but the revised Interim Technical Support Document for the chemical may be subject to change. (Further information is available through AEGL Process).
You may need a PDF reader to view some of the files on this page. See EPA’s About PDF page to learn more.- Butadiene AEGL Technical Support Document (PDF)(58 pp, 402 K)