Breathing Air Quality

BS EN 12021 “Respiratory protective devices - Compressed air for breathing apparatus” specifies requirements for the quality of compressed air supplied for use with:

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Respiratory protective devices - self-contained open-circuit compressed air breathing apparatus and open-circuit compressed air underwater breathing apparatus (SCUBA).
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Respiratory protective devices - compressed air line breathing apparatus and compressed airline breathing apparatus for use under water.
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Respiratory protective devices for escape - self-contained open-circuit compressed air breathing apparatus including full face mask or mouthpiece assembly or hoods.
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For breathing air devices, the quality of the air should be tested at least once every 3 months. Testing criteria is listed below:

BS EN 12021 Requirements
Oxygen
The oxygen content shall be in the range of (21 ± 1) % by volume (dry air).
Lubricant
Lubricant content (droplets or mist) shall not exceed 0.5 mg/m3.
Odour and taste
The air shall be without significant odour or taste.
CO2
The carbon dioxide content shall not exceed 500 ml/m3 (500 ppm).
CO
The carbon monoxide content shall be as low as possible but not exceed 15 ml/m3 (15 ppm).
Water Content
There shall be no free liquid water.
Air for compressed air line breathing apparatus shall have a dewpoint sufficiently low to prevent condensation and freezing. Where the apparatus is used and stored at a known temperature the pressure dewpoint shall be at least 5˚C below the likely lowest temperature. Where the conditions of usage and storage of the compressed air supply is not known the pressure dewpoint shall not exceed -11˚C.

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