Astract:The aim of this work was to identify concentration levels of different chemical forms of mercury (TGM, TPM) in the ambient air in selected areas of the Silesian Region, characterized by low and high mercury emission. Based on the obtained data TGM and TPM concentration levels were determined. The project also focused on determination of dry and wet deposition of mercury compounds. Data concerning TGM and TPM fl ux rates in the ambient air and data on mercury deposition were used to determine a deposition coeffi cient. The coeffi cient was calculated as a share of mercury deposition on the land surface (dry and wet) to the amount of this contaminant transported with loads of air in the form of TGM and TPM in a given measurement station. At both monitoring stations the deposition coeffi cient did not exceed 0.2 %. The idea of calculating the deposition coeffi cient based on the analysis of TGM and TPM fl ux rate is a new solution. The proposed deposition coeffi cient allows to quantify information on a selected contaminant concentration and its potential impact resulting from deposition. Further studies on the deposition coeffi cient may contribute to the development of methods for estimating the impact of contaminants contained in the ambient air on other environmental components based on the analyses of the contaminant fl ux rate.