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Respiratory Protection for Oxygen Deficient Atmospheres.

David Spelce1, Roy T McKay2, James S Johnson3

  • 1921 LeShea Court, Chesapeake, VA.

Journal of the International Society for Respiratory Protection
|April 28, 2020
PubMed
Summary
This summary is machine-generated.

This article compares Occupational Safety and Health Administration (OSHA) and ANSI/ASSE Z88.2 standards for assessing oxygen (O2) deficiency. It highlights how Z88.2

Keywords:
Oxygen Deficient AtmospheresRespirator programRespiratory protectionZ88.2 standards

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Area of Science:

  • Occupational Health and Safety
  • Industrial Hygiene
  • Respiratory Protection

Background:

  • Workplace oxygen deficiency poses significant risks, necessitating clear standards for assessment and protection.
  • Existing regulations, such as OSHA's 29 CFR 1910.134 and ANSI/ASSE Z88.2-2015, provide frameworks for managing oxygen-deficient atmospheres.
  • Differences in exposure criteria and terminology between these standards can impact respirator selection, particularly at high altitudes.

Purpose of the Study:

  • To compare the oxygen (O2) deficiency assessment criteria and terminology used by OSHA and ANSI/ASSE Z88.2.
  • To analyze the impact of these differences on respirator programs and selection, especially in workplaces above sea level.
  • To discuss alternative solutions for managing high-altitude-related oxygen deficiency.

Main Methods:

  • Comparative analysis of OSHA's 29 CFR 1910.134 and ANSI/ASSE Z88.2-2015 standards.
  • Evaluation of differing approaches to assessing oxygen deficiency levels and hazard identification.
  • Review of respirator selection criteria based on partial pressure of oxygen (PO2) and percentage of oxygen.

Main Results:

  • ANSI/ASSE Z88.2 utilizes the partial pressure of oxygen (PO2) for hazard assessment, defining atmospheres as immediately dangerous to life or health (IDLH) or non-IDLH based on PO2 levels.
  • OSHA defines oxygen deficiency based on the percentage of oxygen, considering atmospheres with less than 19.5% O2 as IDLH.
  • Z88.2 may lead to more conservative respirator selections than OSHA due to its direct reliance on PO2, especially at altitudes above sea level.

Conclusions:

  • The differing methodologies between OSHA and Z88.2 standards for assessing oxygen deficiency can significantly influence respirator selection and program requirements.
  • Understanding the nuances of PO2-based versus percentage-based criteria is crucial for ensuring adequate worker protection in oxygen-deficient environments.
  • Alternative strategies to respirator use for high-altitude oxygen deficiency warrant consideration, though their selection and implementation fall outside the scope of these specific standards.