Summertime study of acid deposition in the Detroit area

A comprehensive acid-deposition measuring station has been set up at the General Motors Technical Center site in Warren, Michigan. A second station is also being operated at a rural site near Lapeer, Michigan, which is approximately 54 km north of the Warren site. This report presents the results of this study for the June-September 1981 period. The rain composition was similar at both sites with the pH averaging 4.1 and the SO sub(4) super(=)/NO sub(3) super(-) equivalence ratio averaging 2.1:1. This similarity suggests that local sources, i.e., relatively high emissions near the Warren site, and low emissions near the Lapeer site, have little effect on rain composition. The SO sub(4) super(=)/NO sub(3) super(-) ratio for individual rain events in Warren reflected to SO sub(2)/NO sub(X) emission ratio in the area from which the event had come.