2019年5月10日 · The Immediately dangerous to life or health air concentration values (IDLH values) developed by the National Institute for Occupational Safety and Health (NIOSH) characterize these high-risk exposure concentrations and conditions and are used as a component of respirator selection criteria first developed in the mid-1970s.

Until this occurs, this list contains IDLH values based on both the 1994 revised criteria and CIB 66 [NIOSH 2014-100]. It is important to note which criteria was applied to develop a specific IDLH value.

2017年3月21日 · The Documentation for Immediately Dangerous to Life or Health (IDLH) Concentrations is a compilation of the rationale and sources of information used by NIOSH during the original determination of 387 SCP IDLH values.

The revised IDLH for carbon monoxide is 1,200 ppm based on acute inhalation toxicity data in humans

The criteria utilized to determine the adequacy of existing IDLH values were a combination of those used during the SCP and a newer methodology developed by NIOSH. These criteria form a tiered approach with acute human toxicity data being used preferentially, followed next by acute animal inhalation toxicity data, and then finally by acute ...

IDLH values are based on a 30-minute exposure duration and have traditionally served as a key 16 component of the decision logic for the selection of respiratory protection devices [NIOSH 2004].

Original (SCP) IDLH: 50 ppm. Basis for original (SCP) IDLH: The chosen IDLH is based on the statements by Patty [1963] that 45 to 54 ppm is “tolerated by man for 0.5 to 1 hour without immediate or late effects; 110 to 135 ppm, however, may be fatal after 0.5 to 1 hour or later, or dangerous to life [Flury and Zernik 1931; Dudley et al. 1942].”

The revised IDLH for ammonia is 300 ppm based on acute inhalation toxicity data in humans

2014年6月6日 · The intent of this document is not only to update the IDLH methodology used by NIOSH to develop IDLH values based on contemporary risk assessment practices, but also to increase the transparency behind their derivation.

Immediately Dangerous to Life or Health Concentrations (IDLH) CAS number: 75–21–8 NIOSH REL: <0.1 ppm (<0.18 mg/m 3 ) TWA, 5 ppm (9 mg/m 3 ) CEILING, 10-minutes/day; NIOSH considers ethylene oxide to be a potential occupational carcinogen as defined by the OSHA carcinogen policy [29 CFR 1990].