The purpose of this study was to investigate the spatial distribution, multi-stage extraction, and distribution of heavy metals (Cr, Cd) in different sizes of sedimentary dust of Qayen cement plant along with its ecological risk assessment. For this purpose, dust sampling was carried out on 5 axes in the range of 500 to 1500 m in the predominant wind direction. Two dust samples were collected in each axis and a total of 10 dust samples. The concentrations of chromium and cadmium in fine grains of less than 63, 63-125, 125-250, 250-500, 500-1000, and 1000-2000 microns were investigated in the weak, sulfide, organic, and strong phases. According to the obtained data from this study, the highest amount of chromium was in multi-stage extraction and 500 and 1500 m distances in stations 4 and 5 and cadmium was in stations of 4. Also, the highest amount of chromium was found in all dust aggregates at the station of 5 with the distances of 500 and 1500 m and the highest amount of cadmium was in all dust aggregates of the station 4The calculation of correlation coefficients in different aggregates and different stages of chemical separation showed that there is a high correlation between chromium at 1500 m with chromium at 500 m and also cadmium at 1500 m with cadmium at 500 m..
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