>>>9773286, >>9773800 OSHA SAYS FACE MASKS THAT REDUCE OXYGEN BELOW 19.5% ARE DANGEROUS
We should be citing the actual reg when meming this information to the normies and employers.
29 CFR § 1910.134
https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.134
1910.134(d)(1)(iii)
The employer shall identify and evaluate the respiratory hazard(s) in the workplace; this evaluation shall include a reasonable estimate of employee exposures to respiratory hazard(s) and an identification of the contaminant's chemical state and physical form. Where the employer cannot identify or reasonably estimate the employee exposure, the employer shall consider the atmosphere to be IDLH (IMMEDIATELY DANGEROUS TO LIFE OR HEALTH).
1910.134(d)(2)(iii)
All oxygen-deficient atmospheres shall be considered IDLH. Exception: If the employer demonstrates that, under all foreseeable conditions, the oxygen concentration can be maintained within the ranges specified in Table II of this section (i.e., for the altitudes set out in the table), then any atmosphere-supplying respirator may be used.
https://www.cdc.gov/niosh/npptl/topics/respirators/disp_part/respsource3respirator.html https://www.osha.gov/Publications/3384small-entity-for-respiratory-protection-standard-rev.pdf
1910.134(d)(2)(iii)
Work operations being conducted in well-controlled atmospheres where oxygen levels are deficient (below 19.5 percent) are typically permit-required confined spaces.
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https://pdhonline.com/courses/c523/OSHA%20Required%20Training%20-%20Respiratory%20Protection%20_%20Course.pdf
1910.134(d)(2)(iii)
You must consider all oxygen-deficient atmospheres to be IDLH.
Atmosphere-supplying respirators must be used in oxygen-deficient atmospheres (where oxygen is less than 19.5%).
You may use any atmosphere-supplying respirator if you can demonstrate that, under all reasonable foreseeable conditions, the oxygen concentration in the work area can be maintained within the ranges specified in the following table (Table II of 29 CFR 1910.134). Otherwise, you must provide employees with full facepiece pressure demand SCBAs or combination full facepiece pressure demand supplied-air respirators with auxiliary self-contained air supply.