One of the parameters used to characterise the air quality at a locati – McqOptions

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1.	One of the parameters used to characterise the air quality at a location is PM25. Here, the suffix ‘2.5’ refers to
A.	average number of suspected particles in 1.0 cm3 of air
B.	size of suspended particles in certain units
C.	concentration of oxides of sulphur and nitrogen
D.	concentration of suspended particles in 2.5 m3 of air
Answer» C. concentration of oxides of sulphur and nitrogen

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