Pollution in larger cities is controlled by

Options :
  1. wide roads
  2. industries away from cities
  3. sanitation and least use of insecticide
  4. all the above
Answer and Explanation :-

Answer: Option 4

Explanation:

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People know what they do frequently they know why they do what they do but what they don't know is what what they do does.
-Michel Foucault Madness and Civilization: A History of Insanity in the Age of Reason