“…But a recent Russian study using spectrofluorescent methods has shown that soot and exhaust products from aircraft contained benzo(a)pyrene which induced malignant tumors in mice. 9 Dr. Daniels is Associate Professor, Department of Meteorology, and Dr. Bach is Professor, Department of Geography, at the University of Hawaii, Honolulu, HI 96822. This is a revised version of Paper No.…”