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What are IDLH considerations

2017-02-20 00:00:00

Some  types of atmospheres contain concentrations of hazardous substances  that places the worker in immediate danger because these concentrations  would impair the ability to leave the work area (self rescue) or  potentially cause irreversible health effects, including serious injury  or death in a matter of minutes. 

There are particular conditions that are considered "Immediately Dangerous to Life or Health (IDLH)". These include:

·         A known contaminant at a concentration known to be IDLH

·         A known contaminant at an unknown concentration with the potential to be IDLH

·         An unknown contaminant at an unknown concentration

·         An untested confined space

·         An oxygen-deficient atmosphere

·         Firefighting

·         Contaminants  at or above 20% of their lower explosive limit (LEL—the  concentration at which the gas or vapour could ignite)

To determine IDLH level of a contaminant, consult the NIOSH Pocket Guide to Chemical Hazards.
Adapted from WorkSafe BC Breathe Safer.