Abstract
A study of the weight concentration of particulate air content was determined at Yaoundé (Cameroon) − 3° 52′N, 11° 32′E — over a complete seasonal cycle starting on 23 November 1974, to 6 December 1975. The distribution of this concentration is log-normal, but shows two populations of definitely different geometric means and similar geometric deviations. The survey of the evolution, in terms of time, of this concentration and of the latitude at which the Intertropical Front crosses the Yaounde meridian reveals the existence of a correlation between these two sizes. Statistically, the plot of concentration vs the latitude of the Intertropical Front of the Yaoundé meridian is shown by an exponential function or a power function. Then, we can come to the conclusion that the existence of these two populations of concentration is connected with the yearly variation in the position of the Intertropical Front.
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