Cause of air pollution is

Options :
  1. vehicles
  2. radioactive substances
  3. smoke
  4. all the above
Answer and Explanation :-

Answer: Option 4

Explanation:

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What i realise now is that the story actually did have a happy ending: the children came back. In spite of everything the adults did to them, the children found their own way home, their pockets full of precious stones and pearls that gleamed and shone in the light.
-Julia Green Drawing With Light