Carbon tetrachloride 56-23-5 (Final) 10 min 30 min 60 min 4 hr 8 hr ppm AEGL 1 NR NR NR NR NR AEGL 2 27 18 13 7.6 5.8 AEGL 3 700 450 340 200 150 You will need Adobe Reader to view some of the files on this page. See EPA’s About PDF page to learn more. Carbon tetrachloride AEGL Technical Support Document (PDF)(95 pp, 1 MB)