A high volume air sampler is operated for 8 hrs in a mine with the flow rate of air varying from 1.5 m3/min to 1.3 m3/min. The empty weight of the filter paper is 2.30 g and the final weight is 2.65 g. The mean concentration of the suspended particulate matter (SPM) during the study period in μg/m3 is
A. 591
B. 550
C. 545
D. 521
Answer: Option D
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