Fog is a colloid since it is a heterogeneous mixture of water, air and suspension particles.

Is fog a mixture or solution?

Fog primarily consists of tiny water droplets suspended in air. It’s basically a ground-level cloud. The fog may also contain CO2, bicarbonates, nitrates and sulfates among other substances dissolved in the water droplets. Therefore, fog is best described as a mixture.

Is fog a solution or colloid?

Fog is a colloid in which drops of liquid water are spread through the air.