It is essential that all gases used in producing a NITROX mixture meet the
breathing gas purity standards outlined in Volume 3. If air is to be used to produce
a mixture, it must be compressed using an oil-free NITROX-approved compressor
or meet the purity requirements of oil-free air. Prior to diving, all NITROX gases
shall be analyzed using an approved O2 analyzer accurate to within ± 0.5 percent.
