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smog
Smog is a kin of air pollution; the word "smog" is a portmanteau of smoke and fog. Classic smog results from large amounts of coal burning in an area and is caused by a mixture of smoke and sulfur dioxide.
Trivia about smog
Nitrogen oxides combined with hydrocarbons in sunlight cause ground-level ozone, AKA this urban pollution
It's a polluted haze found over a city
A scientist came up with this blended word after reading a paper on "'fog and smoke"
(Kelly of the Clue Crew blows out a match and sticks it in a bottle.) The moisture in the air combines with particles of dust from the smoke to form this; Los Angeles is known for it