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aerosols agglomeration Aitken's angstrom units atmosphere Blacktin brownian movement carbon Chem chemical coal dust colloid cosmic dust counts Cunningham's law dangerous dusts density deposited deserts dimensions disease disintegration disperse phase dispersion medium dust particles dust population dust production dust systems earth effect electrical charge electrical precipitation electrostatic precipitation filter formation formed gases greater height huge hygroscopic nuclei important incidental dust increasing industrial dust inhaled jet dust counter Krakatoa less light loess lungs material matter mean free path metal dust micron diameter microscopic Mines molecules nature particle number particle size pollution pressure probably produced pulverized fuel rain rainfall regarded regions relatively sand scientific settling shown silica silicosis smoke particles smoke system solid soot spores square miles staubosphere Stokes surface suspensoids tion tons tube ultra-violet ultra-violet radiation utility dusts variation varying velocity visible volcanic dust whilst Whytlaw-Gray wind zone