Fog vs. Smog: What's the Difference?

Fog and Smog Definitions
Fog
Condensed water vapor in cloudlike masses lying close to the ground and limiting visibility.
Smog
Fog that has become mixed and polluted with smoke.
Fog
An obscuring haze, as of atmospheric dust or smoke.
Smog
A form of air pollution produced by the photochemical reaction of sunlight with hydrocarbons and nitrogen oxides that have been released into the atmosphere, especially by automotive emissions.
Fog
A mist or film clouding a surface, as of a window, lens, or mirror.
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Smog
A noxious mixture of particulates and gases that is the result of urban air pollution.
Fog
A cloud of vaporized liquid, especially a chemical spray used in fighting fires.
Smog
(informal) To get a smog check; to check a vehicle or have it checked for emissions.
If the car is more than five years old, you'll have to have it smogged before you can register it.
Fog
A state of mental vagueness or bewilderment.
Smog
Air pollution by a mixture of smoke and fog
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Fog
Something that obscures or conceals; a haze
Shrouded their actions in a fog of disinformation.
Fog
A blur on a developed photographic image.
Fog
A new growth of grass appearing on a field that has been mowed or grazed.
Fog
Tall, coarse grass left standing in fields through the winter.
Fog
To cover or envelop with fog.
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Fog
To cause to be obscured; cloud.
Fog
To make vague, hazy, or confused
A memory that had been fogged by time.
Fog
To obscure or dim (a photographic image).
Fog
To be covered with fog.
Fog
To be blurred, clouded, or obscured
My glasses fogged in the warm air.
Fog
To be dimmed or obscured. Used of a photographic image.
Fog
(uncountable) A thick cloud that forms near the ground; the obscurity of such a cloud. mist, haze.}}
A bank of fog
Fog
(uncountable) A mist or film clouding a surface.
Fog
A state of mind characterized by lethargy and confusion.
He did so many drugs, he was still in a fog three months after going through detox.
Fog
(photography) A silver deposit or other blur on a negative or developed photographic image.
Fog
(computer graphics) Distance fog.
Fog
A new growth of grass appearing on a field that has been mowed or grazed.
Fog
Tall and decaying grass left standing after the cutting or grazing season.
Fog
(Scotland) Moss.
Fog
(intransitive) To become covered with or as if with fog.
Fog
(intransitive) To become obscured in condensation or water.
The mirror fogged every time he showered.
Fog
To become dim or obscure.
Fog
To make dim or obscure.
Fog
To spoil (film) via exposure to light other than in the normal process of taking a photograph.
Fog
(transitive) To cover with or as if with fog.
Fog
(transitive) To disperse insecticide into (a forest canopy) so as to collect organisms.
Fog
(transitive) To obscure in condensation or water.
Fog
(transitive) To make confusing or obscure.
Fog
To practice in a small or mean way; to pettifog.
Fog
(transitive) To pasture cattle on the fog (of), or aftergrass, of; to eat off the fog from (a field).
Fog
(intransitive) To become covered with the kind of grass called fog.
Fog
A second growth of grass; aftergrass.
Fog
Watery vapor condensed in the lower part of the atmosphere and disturbing its transparency. It differs from cloud only in being near the ground, and from mist in not approaching so nearly to fine rain. See Cloud.
Fog
A state of mental confusion.
Fog
Cloudiness or partial opacity of those parts of a developed film or a photograph which should be clear.
Fog
To pasture cattle on the fog, or aftergrass, of; to eat off the fog from.
Fog
To practice in a small or mean way; to pettifog.
Where wouldst thou fog to get a fee?
Fog
To envelop, as with fog; to befog; to overcast; to darken; to obscure.
Fog
To render semiopaque or cloudy, as a negative film, by exposure to stray light, too long an exposure to the developer, etc.
Fog
To show indistinctly or become indistinct, as the picture on a negative sometimes does in the process of development.
Fog
Droplets of water vapor suspended in the air near the ground
Fog
An atmosphere in which visibility is reduced because of a cloud of some substance
Fog
Confusion characterized by lack of clarity
Fog
Make less visible or unclear;
The stars are obscured by the clouds