ALERT Learn More | NASP Certification Program: The Path to Success Has Many Routes. Choose Yours

What is a hazardous atmosphere?

By Bob Henderson | Last updated: January 15, 2019
Presented by GfG Instrumentation

According to OSHA, a “hazardous atmosphere” is an atmosphere that may expose employees to the risk of death, incapacitation, impairment of ability to self-rescue, injury, or acute illness from one or more of the following causes:

Note: This concentration may be approximated as a condition in which the combustible dust obscures vision at a distance of 5 feet (1.52 meters) or less.

  • Atmospheric oxygen concentration below 19.5% or above 23.5%
  • Atmospheric concentration of any substance with an OSHA permissible exposure limit above the permissible exposure limit (PEL)
  • Any other atmospheric condition that is immediately dangerous to life or health


Share this Q&A

  • Facebook
  • LinkedIn
  • Twitter


OSHA Standards Confined Space Lockout Tagout (LOTO)

Presented By

Logo for GfG Instrumentation

Written by Bob Henderson | President

Profile Picture of Bob Henderson

Bob Henderson is President of GfG Instrumentation, Inc. in Ann Arbor, Michigan.Robert has been a member of the American Industrial Hygiene Association since 1992. He is an active member of the AIHA Real Time Detection Systems Technical Committee, and the AIHA Confined Spaces Committee. He is also a past chair of the Instrument Products Group of the International Safety Equipment Association. Robert has over 37 years of experience in the design, sale and marketing of atmospheric monitoring instruments used in confined space, industrial safety, and industrial hygiene monitoring applications.

More Q&As from our experts

Related Articles

Go back to top