Environmental legislation requires that power plants monitor the composition of their ash as well as the impact of the emissions or possible re-usage of the ash on the environment. However, this elemental data has not been commonly used for evaluating workers’ exposure, which was our aim in this study. The results of this study showed equally high elemental median amounts, and estimated exposure between bottom and fly ashes in pellet-, wood- and peat-fired power plants, and clearly higher median amounts, and higher estimated exposure in an SRF power plant. The results of combined element ash data, and measured inhalable dust air concentrations showed good correlations and p-values (p <0.0001) of Mn, Th, Al, and Cd. According to these results, it seems to be important to use environmental elemental ash data in worker exposure assessments in biomass-fired power plants.