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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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