The research focus of this group is to understand the fate and transport of persistent contaminants in the environment. We combine mechanistic knowledge and observational data to develop numerical models for different environmental compartments and their interfaces (e.g. atmosphere, land, ocean, rivers, and ecosystems). These models are applied at both regional and global scales to characterize how anthropogenic emissions and changing climate impact the environmental quality and human health. We also measure pollutant concentrations and fluxes in environmental samples for model evaluation. Current projects focus on air-sea exchange of mercury, influence of global change on persistent contaminant fate, and impact of microplastics on marine environment.