Abstract
The purpose of this paper is not to compare the performances of two instruments. The experiments and the discussion are rather meant to stress that two quite different instruments, sampling at widely differing velocities and flow rates, nevertheless show near agreement in concentration, when confronted with: (a) the turbulent conditions; (b) the real, rather narrow particle size spectrum, practically met in urban conditions. As concentration and particle size measurement are known to be quite sensitive to intake velocity in laminar conditions, some conclusions are further drawn about how instrument comparison should be performed. To approach the real urban outdoor conditions, only turbulent test facilities should be used.
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