Is air a homogeneous mixture or heterogeneous mixture ?

AIR IS A HOMOGENEOUS MIXTURE OF GASEOUS SUBSTANCE LIKE NITROGEN OXYGEN CARBON DIOXIDE etc.

Homogeneous Mixture
 

A heterogeneous mixture is a type of mixture in which the components can be seen, as there are two or more phases present. One example of a mixture is air. Airis a homogeneous mixture of the gaseous substances nitrogen, oxygen, and smaller amounts of other substances.

Air is a homogeneous mixture.

It is a heterogenus mixture

 air is a homogeneous mixture