Compressed air pose hazard not many people think about!
Most untreat air have moisture and oil if compressor pump use (liquid) oil lubrication system.
Static trail build up from air flowing through normal butyl line hose can charge conductor trace in system to over 1kV enough to cause damage!
So if you want low risk, use PROPER equipment! Inert gas such as argon/nitrogen/carbon dioxide work with approve system of delivery. Never use more than 6 bar pressure! If pressure at hose higher use safety tip. Treated air (-40C dewpoint) should pass through polonium static removal tip to prevent ion transfer to sensitive onboard equipment.
Really this should be common sense to train person!