d "nitrox" doesn't tell the Primal Core relationship of those elements. So air is nitrox too because it's (basically) nitrogen (78%) and oxygen (21%).And a slice of trace elements like carbon monoxide, carbon dioxide, smog, arsenic, cigarette smoke,etc.The base of word nitrox could be the expression Nx/Ox, where N is caffeine sign of nitrogen and O will be the chemical sign of oxygen. Because it helps an example N(50)O(50) might be 50% oxygen. So basically nitrox can be any mix of nitrogen and oxygen containing 1 to 99 % of oxygen (and rest is nitrogen). https://www.fitdiettrendz.com/primal-core/