Hydrogen chloride 7647-01-0 (Final) 10 min 30 min 60 min 4 hr 8 hr ppm AEGL 1 1.8 1.8 1.8 1.8 1.8 AEGL 2 100 43 22 11 11 AEGL 3 620 210 100 26 26 You will need Adobe Reader to view some of the files on this page. See EPA’s About PDF page to learn more. Hydrogen Chloride AEGL Technical Support Document (PDF)(76 pp, 1 MB)