| Summary: | International Symposium on the Chemistry of Sea-Air Particulate Exchanges, celebrado del 4 al 10 de octubre de 1973 en Niza.-- 16 pages, figures On a global scale, the total estimated mass of particulate materia is 2.5 x 10 9 tons/year, with almost half this amount in particles of diameter less than 5 microns (1). Man-male emissions contribute approximately 20% of this figure. Particulate transport processes occur predominantly in the troposphere, although some transport is found in the stratosphere followed by settling to the troposphere. The tropospheric circulation is dominantly zonal with three main zones of air mass movement in each hemisphere. the equatorial easterlies, the temparate westerlies, and the polar easterlies (2). Arid areas of the continents contribute particulates to each of these zones. Precipitation scrubbig appears to be the most important mechanism of fallout from the troposphere (3). [.] Peer reviewed
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