“…In contrary, this study concluded that O2 levels played a critical role in the formation of PCDD/Fs during de novo synthesis. The results of the present study are consistent with those of Zhang et al[36], Potter et al[37], and Xu et al[38] indicating that both precursor formation and de novo synthesis play significant roles in the generation of PCDD/Fs within the post-combustion zone of a municipal solid waste incinerator. On the other hand, in oxygen-deficient conditions, chlorinated compounds may persist longer increasing the risk of PCDD/F generation.…”