Provincial atmospheric emission inventories for pentachlorobenzene(PeCBz)and hexachlorobenzene(HxCBz)from unintentional sources in the Chinese mainland
A dynamic emission factor database was constructed utilizing a technical split method.A bottom-up approach based on emission factor method was employed to establish a comprehensive atmospheric emission inventory of pentachlorobenzene(PeCBz)and hexachlorobenzene(HxCBz)from unintentional sources at the provincial level in the Chinese mainland for the years 1960 to 2019.The spatiotemporal distribution characteristics of these emissions were investigated.The results revealed that the primary source of PeCBz emissions was the production of chlorine-containing chemicals,while for HxCBz,it was the production of metals.The emission density for both PeCBz and HxCBz exhibited a pattern of higher values in the eastern regions compared to the western regions.Over the period from 1960 to 2019,the emissions of PeCBz and HxCBz increased from 1277.9 and 81.2kg,respectively,to 11862.3 and 439.7kg.However,the emission intensity(emissions per unit GDP)decreased from 869.3 and 55.2g per billion yuan to 12.0 and 0.4g per billion yuan for PeCBz and HxCBz,respectively.
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