Wiktionary
photochemical smog
n. air pollution caused by photochemical reactions involving hydrocarbons, nitrogen oxides and other pollutants, especially in still air over cities
Usage examples of "photochemical smog".
The magic of ultraviolet radiation, photochemical reactions, photochemical smog: it magically cracks rubber.
In the murk of photochemical smog, her suit lights penetrated barely a few feet.
There was still dust here, dust and lung-crippling clouds of photochemical smog from cars and trucks.
The dark-red color of Titan is due to a photochemical smog of organic (i.