ABSTRACT
Atmospheric aerosols comprise a dispersed system of small solid and liquid particles suspended in air. They remain suspended for varying periods of time, and are then transported by vertical and horizontal wind currents, frequently to great distances. Aerosols are formed by a primary source that includes dispersion of particulates from the Earth's surface and a secondary source resulting from atmospheric chemical reactions, condensation, or coagulation processes. This entry summarizes the knowledge about aerosols and their size distribution, and present some measurements and measurement techniques.
