Nitrous Oxide is a nontoxic, nonflammable, colorless gas with a slightly sweet taste and odor. Medical GradeContaminantsTest ConcentrationTest ResultPurity(%)>99.099.21H2O(g/m3)<0.150.00054CO(ppm)<100.541CO2(ppm)<3000.416CL2(ppm)<1NDNH3(ppm)<250.3Air(%),(78%N2,22%O2)<10.83NOx(ppm)<20.2 N2O nitrous oxide