Abstract
By means of multiple linear regression analysis of a suite of more than 10 000 concentration measurements, of 14 elements at 11 sampling stations every 2 h over the course of a week in July 1975, Pb was found to be correlated in time most strongly with Br, secondarily with Zn, and also with K and Fe. At one station some Pb variation was apparently independent of other elements. On this basis and on the basis of wind directional relationships among the elements, at least four different components of Pb in the St. Louis aerosol may be identified.
