Air quality & compliance • Technical education
Why compressed air is not automatically breathing air
Industrial compressed-air systems can introduce or concentrate contaminants. An apparently clean stream may still contain hazardous gases, oil aerosol, vapour or moisture. Respiratory use requires a design, controls and verification appropriate to the actual application.
Where EN 12021 fits
EN 12021 sets requirements for compressed gases used for breathing apparatus. Its application and referenced edition should be confirmed for the project. Claiming compliance requires representative testing and documented controls, rather than merely specifying a filter advertised as breathable air.
ISO 8573-1 is not a breathing-air approval
ISO 8573-1 classifies industrial compressed air for particles, water and oil. It is valuable for process air but does not, on its own, certify air as safe for breathing or address every required respiratory contaminant.
Common contamination pathways
Risks include intake exhaust gases, carbon monoxide, volatile chemicals, incorrect or degraded lubricants, water ingress, filtration saturation and inadequate preventive maintenance. Contaminant risks vary with site environment and compression technology.
Sampling, monitoring and traceability
Sampling should follow the applicable test method, operating conditions and specification. Record the sampling point, date, running conditions, test provider, results and remedial actions. A passing result at one moment is not a substitute for control of changing conditions.
Specify the system, not just the compressor
Review intake siting, purification train, filter and lubricant compatibility, pressure and temperature limits, maintenance intervals, test plan and competent operation. Independently verify air quality when required by the client or applicable standard.
Frequently asked questions
Does filtration alone make compressor air breathable?
No. Filtration is one component; proper design, source control, operating procedures and appropriate verification remain necessary.
Is ISO 8573-1 Class 1 suitable for people to breathe?
A particle/oil/water classification alone does not demonstrate full breathing-air suitability.
How often should breathing air be tested?
Frequency should be determined by the relevant standard, equipment instructions, client requirements and documented risk assessment.
