Smog, according to Science Officer Spock, is the presence of moderately "industrialized pollution containing substantial amounts of carbon monoxide and partially consumed hydrocarbons." He made this statement after conducting a tricorder scan of the planet 892 IV, and noted that its composition was similar to the atmosphere found on 20th century Earth. Doctor Leonard McCoy noted that a colloquial term describing the phenomenon is "smog." (TOS: "Bread and Circuses")
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