BY YOUR REASONING THE DEEPSTATE ARE HUMAN AS WELL SO WHY GO AFTER THEM?
MASS MIGRATION IS OK IF DONE LEGALLY!
SO WHITES ARE NOT HUMAN? AREN'T JEWS WHITE?
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.