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      Question

      In the context of air pollution measurements, what does

      "PM2.5" refer to? 
      A The duration of the test Correct Answer Incorrect Answer
      B The size of the particulate matter Correct Answer Incorrect Answer
      C The number of pollutants Correct Answer Incorrect Answer
      D The average interval between readings Correct Answer Incorrect Answer

      Solution

      PM2.5 refers to particulate matter with a diameter of 2.5 micrometers or less, which can penetrate deep into the respiratory system.

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