Why is clean air clean? Schwartz, S. E. In Precipitation Scavenging and Atmosphere-Surface Exchange, Schwartz, S. E. and Slinn, W. G. N., Coord. Eds. Vol. 1, pp. 393-399. Hemisphere, Washington DC, 1992.

Air exhibiting very low concentrations of light-scattering aerosol particles is occasionally observed even in industrialized regions. Evidence is presented that this very clean air results from highly efficient removal of aerosol particles coupled to the removal of water in precipitation.

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