Contract "Since changes may be made before final publication, this preprint is made available with the understanding that it will not be cited or reproduced without permission"--Cover. "To be presented at the International Conference on Atmospheric Sciences and Application to Air Quality, Seoul , Korea, May 20-24, 1985 and to be submitted to Atmospheric Environment"--t.p. "Argonne National Laboratory, with facilities in the states of Illinois and Idaho, is owned by the United States government, and operated by the University of Chicago under the provisions of a contract with the Department of Energy"--Inside front cover.