Authority: IC 15-16-1-6; IC 15-16-1-7

Affected: IC 15-16-1

Sec. 21. "Immediately dangerous to life or health" or "IDLH" means the maximum concentration from which unprotected persons are able to escape within thirty (30) minutes without escape-impairing symptoms or irreversible health effects. The IDLH for ammonia is three hundred (300) parts per million by volume in accordance with the NIOSH Pocket Guide to Chemical Hazards, including current amendments and latest edition of the same.

(State Chemist of the State of Indiana; 355 IAC 3-1.5-21; filed Jan 19, 2001, 2:04 p.m.: 24 IR 1625; readopted filed Jun 20, 2001, 3:22 p.m.: 24 IR 3822; readopted filed Apr 27, 2007, 2:03 p.m.: 20070509-IR-355070039RFA; readopted filed Nov 25, 2013, 3:27 p.m.: 20131225-IR-355130482RFA; readopted filed Jul 2, 2019, 10:42 a.m.: 20190731-IR-355190258RFA; readopted filed Nov 4, 2025, 2:37 p.m.: 20251119-IR-355240619RFA)