“…These combustion processes include the incineration of municipal wastes (2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14) and the combustion of automotive fuels (15); these processes generate complex mixtures of PCDD/F (i.e., PCDD + PCDF) with varying numbers of + Current address: Connecticut Agricultural Experiment Station, 123 Huntington St., New Haven, CT 06504. chlorine atoms and with varying sites of chlorine substitution, depending on fuel composition and combustion temperature. Because of the varying toxicities of PCDD/F, it is important to understand the processes and parameters that control the rate at which individual compounds undergo transformations while in the atmosphere.…”