Risk assessment of emitted particle polycyclic aromatic hydrocarbons (PAHs) from lignite-biomass pelletization burning focusing on size distribution and human health effects are investigated. The particles and PAHs are experimented by a tube furnace and high performance liquid chromatography coupled diode array and fluorescence detectors (HPLC-DAD/FLD), respectively. The carcinogenic, mutagenic, and toxic potencies of PAHs are also discussed in relative to the size distribution of emitted particle PAHs. The results indicate that the carcinogenic, mutagenic, and toxic potencies of PAHs are like to accumulate in the ultrafine particles finer than 0.65 µm. The ultrafine particles contribute the largest PAHs existences of carcinogenic, mutagenic and toxic substances; even though they register in the small mass fraction of PAHs. Moreover, the co-pellets burning can reduce the values of carcinogenic PAHs, carcinogenic equivalency quotients (BaP-TEQ), mutagenic equivalency quotients (BaP-MEQ), and toxic equivalency quotients (TCDD-TEQ) by more than 60%.
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