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Here,we examined the incineration of extruded polystyrene containing hexabromocyclododecane (HBCD) in a pilot-scale incinerator under various combustion temperatures (800-950℃) and flue gas residence times (2-8 sec).Rates of HBCD decomposition ranged from 99.996％ (800℃,2 sec) to 99.9999％ (950℃,8 sec);the decomposition of HBCD,except during the initial stage of combustion (flue gas residence time ＜ 2 sec),followed a pseudo-fast-order kinetics model.An Arrhenius plot revealed that the activation energy and frequency factor of the decomposition of HBCD by combustion were 14.2 kJ/mol and 1.69 sec-1,respectively.During combusrion,11 brominated polycychc aromaric hydrocarbons (BrPAHs) were detected as unintentional by-products.Of the 11 BrPAHs detected,2-bromoanthracene and 1-bromopyrene were detected at the highest concentrarions.The mutagenic and carcinogenic BrPAHs 1,5-dibromoanthracene and 1-bromopyrene were most frequently detected in the flue gases analyzed.The total concentration of BrPAHs exponentially increased (range,87.8-2,040,000 ng/m3) with increasing flue gas residence time.Results from a qualitative analysis using gas chromatography/high-resolution mass spectrometry suggest that bromofluorene and bromopyrene (or fluoranthene) congeners were also produced during the combustion.