Depends on the quantity of air you are considering.
pure air is homogeneous but dusty air is heterogeneous
Pure air is homogeneous because all components are completely miscible.
heterogeneous
homogeneous
air is homogeneous
Air is a homogeneous mixture.
Air is homogeneous mixture of gases.
Air is a homogeneous mixture.
Air is a homogeneous mixture.
homogeneous
homogeneous
Airt is a homogeneous mixture.