Page 51 - Fundamentals of Air Pollution 3E

TABLE 2-4
Particle Size Ranges and Their Methods of Measurement
Suspended or
Particle size settleable; Dispersion Condensation Pollen and Sedimentation, diffusion,
range (urn) Ions Nuclei Visabiliry nonairborne aerosol aerosol spores and settling
4
I(T -l(r 3 Small Suspended - Gas molecules — Diffusion
3
10~ -10~ 2 Intermediate and large Aitken nuclei Electron microscope Suspended Vapor molecules — Diffusion
1
KTMO" Urge Aitken and condensation Electron microscope Suspended Fume-mist — Diffusion
nuclei
Air pollution
IQ-i-lQ- 0 — Condensation nuclei Microscope: Suspended Dust- mist Fume-mist — Diffusion and sedimentation
electron and
optical
l
W°-W — — Microscope: optical Suspended and Dust-mist Fume-mist — Sedimentation
settleable
lO'-lO 2 — — Eye, sieves Settleable Dust-mist Mist-fog Pollen and
spores
lOMO 3 — — Eye, sieves Nonairborne Dust-spray Drizzle-rain — Sedimentation
ic^-io 4 — — Eye, sieves Nonairborne Sand-rocks Rain — Sedimentation