Air is a noun and not and adjective, hence it can not be a property. Gas would be a physical property describing air. Inert (for example) would be a chemical property.
The property of air that a gas exhibits is that it can be compressed and it occupies space.
air has volume air has mass
The property is flammability.
This is a chemical property.
The fact that it oxidizes in air is a chemical property of methane.
Chemical property
Combustibility is a chemical property.
actually no its not
No it's not.
Air has mass. Mass is a property and does not have mass
The temperature of the air.