Why Is Air a Homogeneous Mixture

Is Polluted air a heterogeneous mixture?

If you are simply talking about air being a mixture of gases (nitrogen, oxygen, carbon dioxide etc.) than air is a homogeneous mixture. If however, you add in dust, pollution, or water vapor (think clouds) it is a heterogeneous mixture.

Is air with fog homogeneous or heterogeneous?

Hydrogen – element Fog is a colloid. Colloids are homogeneous mixtures that have larger particles that do not settle out of the solution. When light is shined through a colloid, it scatters off of the particles. Air is a mixture of several different gases, such as oxygen, nitrogen, and carbon dioxide.