PFAS is not a single chemical but rather a broad class of chemicals (more than 4,700) that are widely used in industrial processes and consumer goods. The two most notorious PFAS (PFOA and PFOS sub-groups) are confirmed to cause serious health issues and pose a risk to public health. For this reason, many countries have banned their production, but efforts are still needed to clean up contamination in water supplies and soils.
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Increasing product sophistication means waste is becoming more complex (and dangerous).