Lanzhou, China, is known as the "City of Smoke" due to its severe air pollution and industrial smog. The city's geography, surrounded by mountains, traps pollution, leading to poor air quality.
Other options:
London (B) → Known as the "City of Fog" due to historical smog issues.
Kolkata (C) → Not commonly associated with the "City of Smoke."
Chicago (D) → Known as the "Windy City," not the "City of Smoke."
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