Smog is a homogeneous mixture heterogeneous mixture

Smog is a heterogeneous mixture.

Explanation:

The mixtures are classified into two type depending upon their uniformity. When the mixture is uniformly distributed, it is called as a homogeneous mixture and when the mixture is spread in a uneven manner, it is called as an heterogeneous mixture. Smog is a chemical reaction which occurs when rays of light reacts with nitrogenous oxides. It is also a type of air pollution.

come closer and become far apart and become steam/gas

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