Question
In the context of air pollution measurements, what does
"PM2.5" refer to?ÂSolution
PM2.5 refers to particulate matter with a diameter of 2.5 micrometers or less, which can penetrate deep into the respiratory system.
More Science and technology Questions
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The speaker broke down in the middle of his speech.
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The traffic came to a standstill after the heavy downpour of rain.
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