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Which of these statements about particulate matter less than 2.5 microns in diameter is true?
O A. They're the size of a human hair.
O B. They're less of a threat than particulate matter that's 10 microns in diameter.
O C. They're produced from nitrogen gas (N2).
O D. They can cause heart and lung disease.
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Which of these statements about particulate matter less than 2.5 microns in diameter is true?
O A....
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