air - anti
- air oxidation
- air pallet
- air park
- air passage
- air percussion drilling
- air permeability
- air permeability tester
- air pipe
- air pit
- air plan
- air pocket
- air pollutant
- air pollution
- air pollution control
- air pollution index
- air pollution surveillance
- air pollution survey
- air port
- air pressure
- air pressure gage
- air pressure regulator
- air pressure tester
- air pressurization system
- air priority
- air pump
- air purge
- air purifier
- air quality index
- air quenching
- air raise
- air reaction
- air receiver
- air rectification
- air reducer
- air refrigerating unit
- air register
- air release collet
- air release master
- air renewal
- air report