What is "smogs"

Usage examples of "smogs".

Besides it was meant to be a rough trip to dispel the smogs and grimes of civilization, a nostalgic return to the expeditions we had made together in our youth.

The Floridians hit back by pointing to the famous Los Angeles smogs, then the Californians say, with careful anxiety, "Isn’t it about time you had another hurricane?

It resembled no natural fog he had ever seen, unlike the famous blackouts of London, the poisoned industrial smogs of his own world.