Q69
PM2.5 refers to
A.
Mass of particles of size less than 2.5 μrn
B.
Mass of particles of size greater than 2.5 μrn
C.
Number of particles of size less than 2.5 μrn
AnswerD.
Number of particles of size greater than 2.5 μrn
Answer: Option C
Solution
Answer: Option C
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