An innovative GIS-Based visualization tool for inverse computation of pollutant emission rates is developed in this study． Using endpoint data obtained by the HYSPLIT forward trajectory model and the air dispersion data obtained by the CALPUFF model both driven by WＲF meteorological forecast data， the GIS-based tool can visualize and inversely calculate the pollutant emission rates from stacks． To demonstrate the effectiveness of this tool， emissions of Hg2+ from Likeng waste incineration plant in Guangzhou， China was used as a test case since the background concentration of Hg2+ is extremely low in air． The case study results show that the estimated emission concentrations of Hg2+ are consistently agreeable with the on-site monitoring data in the stack plume ( Ｒ2 = 0．801) ． This tool provides a new modeling method with key information ( e．g． pollutant emission rate and air dispersion area) for decision support of emergent pollutant emission control．

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