Abstract
The existence of particles in the atmosphere was established by John Aitken whose work is related to recent studies. The concentration and composition of Aitken nuclei are discussed and contemporary measurements of the output of natural and human sources are reviewed. Larger particles are not adequately described by the Junge size distribution, and do not produce a self-preserving size distribution; they result from a variety of independent sources. Reduction of visual range is achieved most economically by particles of 0.3–0.4 μm radius. Estimates are quoted for the proportion of natural particles in the atmospheric aerosol.
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