Trapping pollutants: Temperature
Inversion and smog
You may be familiar with the term smog to describe the hazy brown color in the air around large cities or after a forest fire. The term originally described the specific combination of smoke and fog that discolored the air as a result of coal burning during the industrial revolution ,but smog no longer means simply smoke and fog . Nowadays, the term smog refers to the complex combination of primary and secondary pollutants that turn the air a brown or yellow color. (the earlier section ‘’sorting out common pollutants ‘’ gives you the skinny on the different kinds of pollutanats.)