If your primary meaning is the noun for the stuff we breathe, an alternative would be the verb meaning to refresh something (e.g. laundry) by allowing fresh air to get to it. Another is the noun meaning someone's manner. 'She had an air of responsibility about her'.
examples of air transportation
The meaning of aero-: 1. In the air aeroplane
water pollution: polluting water air pollution: polluting air
pneumo
Vatanukulit
aero
hanging in the air
The amount of moisture in the air.
One would be the air having 100% relative humidity, meaning all the air is at the same temperature.
Air is compressible, meaning its volume can change in response to changes in pressure.
the force exerted onto a surface by the weight of the air
no they have gills meaning they are fish not air breathers