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[–] goatsandbros 0 points 2 points (+2|-0) ago 

So the OSHA standard is based on blood O2, and not the O2 that is available to breathe?

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[–] MrEvilPirate 0 points 1 point (+1|-0) ago 

The OSHA standard is based on environmental conditions. Has nothing to do with dissolved O2 in your blood. For instance you need to go down into a manhole or other confined space, you need to have a meter with you to make sure O2 levels aren't too low. Gasses could drop down and displace the O2. Measuring inside the mask isn't really the same thing. I work in construction and the safety guy at our company is hardcore so we go through training on this stuff all the time.

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[–] goatsandbros ago 

The OSHA standard is based on environmental conditions. Has nothing to do with dissolved O2 in your blood

There we are.

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[–] RealBiggly 2 points 0 points (+2|-2) ago 

The INSIDE of your mask is not what you measure. You want to measure the air outside it.

You want to know if it's affecting you? Measure your blood.

FINK about it. You cannot claim the mask is somehow killing you if your blood oxygen level is fine.

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[–] goatsandbros 1 point 5 points (+6|-1) ago 

The inside of your mask is what you're breathing.

Also: does the OSHA standard measure blood O2 levels?