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      Question

      PM2.5 in air pollution refers

      to:
      A Sulphur dioxide Correct Answer Incorrect Answer
      B Carbon monoxide Correct Answer Incorrect Answer
      C Ozone particles Correct Answer Incorrect Answer
      D Particulate matter with diameter ≤ 2.5 micrometers Correct Answer Incorrect Answer
      E Lead particles Correct Answer Incorrect Answer

      Solution

      PM2.5 are fine inhalable particles that penetrate deep into the lungs, causing major health hazards.

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