Particle count data were integrated in the ranges of (1) 0.4–2.5 μm (the first
stage: 11 channels), (2) 2.5–10 μm (the second stage: eight channels), and (3)
10–32 μm (the third stage: seven channels). These data were then applied to
the computation of removal efficiencies for each PM fraction of PM2.5, PM10,
and TSP, respectively.