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Pollution: Smog as Cause MCQs App Download & e-Book PDF - 914

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MCQ: 914

No smog occurs if

  1. cool air is allowed to escape
  2. if pollutants like smoke and sulphur dioxide are prevented from escape
  3. if cool air and pollutants are prevented from escape
  4. if pollutants like smoke and sulphur dioxide are escape
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