Toxic Planet — David Ratte

In Sam's world, pollution is such that everyone is forced to wear gas masks at all times. He lives with a lovely young woman whose face he has not seen in years. Though pollution still poses a few (arguably) negligible problems here and there, Sam finds the state of his world. . . normal! At the factory where he works, everyone seems resigned to live in such putrid surroundings; "It's just how things are!" "It's not dangerous!" they say.

Sure, it's not dangerous. Not all of the time, anyway.