For the indoor air measurements (room or chamber), several techniques are used, such as Condensation Particle Counter (CPC) for the total particle number of sub-micron particles 19 , Fast Mobility Particle Sizer (FMPS) 20 , and Scanning Mobility Particle Sizer (SMPS) 15,21 for the total number and the particle size distributions in the range of 5.6 to 560 nm 20
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