The OLD and NEW IDLH and a little history about the MOST important term for any HAZMAT Technician

What has changed in the definition of an IDLH atmosphere? NIOSH has removed the mention of the 30 minute time period, based on intraspecies variation factors. There is no mention of the 30-minutes in the new definition.  A little history about the IDLH designation…  The concept of using respirators to protect workers in situations that...

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