London-type smog typically forms when particles in coal smoke combine with water droplets in humid air.

In this question, there are no options given to choose from. I hope you wanted to know whether the statement in question is true or false. Based on this assumption, i am answering the question. It is true that London type smog typically forms when particles in coal smoke combine with water droplets in humid air. 

Proteins vitamins and a carbohydrate is a atom