Employers have a duty of care to their employees to ensure the air they breathe is of the best quality possible. If you use compressed breathing air it is essential to monitor for contaminants including carbon monoxide (CO), carbon dioxide (CO2) andand residual oil content as they can cause serious health effects, particularly as the effects of such contaminants are increased at pressure.
Even new, well-sited and well-maintained compressors can sometimes fail and contaminants can also enter into the breathing air through the intake. Continual monitoring is safer and more accurate than "spot checking" such as using colorimetric tube testing kits at intervals. The user in achieving compliance with breathing air standards and other local regulations.