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What does "Smog" refer to?

  1. a. The sun with the celestial bodies that revolve around it in its gravitational field

  2. b. A condition caused by deficiency of ascorbic acid (vitamin C)

  3. c. Air pollution by a mixture of smoke and fog

  4. d. Water that is not hard (does not contain salts that interfere with the formation of lather with soap)

The correct answer is: c. Air pollution by a mixture of smoke and fog

"Smog" refers to air pollution caused by a mixture of smoke and fog. This combination creates a harmful and visible haze that can have serious consequences on the environment and human health. Option A refers to the solar system, Option B refers to a deficiency of vitamin C, and Option D refers to water quality, none of which accurately describe what smog is.