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Highly fluorinated chemicals, sometimes referred to as PFASs, are used in many consumer products and industrial applications because of their oil-, stain-, and water-repellent properties. Many of these chemicals are persistent and may accumulate in the body. In states including Colorado, Michigan, Pennsylvania, New York, and North Carolina, local water systems have been contaminated with PFASs, and there is a growing movement towards better regulation of these chemicals. This collection provides a glimpse of how exposure science is advancing understanding of the relationship between exposure to PFAS and human health impact, as well as enabling actions to address concerns related to PFAS.