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>>/14/ Normal air is 21% oxygen. Breathing air with less than19.5% oxygen is considered bad. A mask reduces the 21% to 18-18.5%. From memory, can't remember the source. There was a video where a guy was measuring the level under the mask.
>>/14/ Normal air is 21% oxygen. Breathing air with less than19.5% oxygen is considered bad. A mask reduces the 21% to 18-18.5%. From memory, can't remember the source. There was a video where a guy was measuring the level under the mask.