Which particles make up the largest fraction of PM2.5, the class of po – McqOptions

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1.	Which particles make up the largest fraction of PM2.5, the class of pollutants closely linked to cardiovascular and respiratory illness, according to a study?
A.	Carbon Dioxide
B.	Nitrogen
C.	Methane
D.	Sulphur Dioxide
Answer» C. Methane

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