EPA Floats Advisory Freshwater ‘Screening Levels’ For Tire Chemical 6PPD

EPA has released acute water quality screening values for the tire chemical 6PPD and its breakdown product 6PPD-quinone (6PPD-q) as part of a burgeoning effort to address the substances’ recently discovered links to fish kills, while acknowledging that data on their toxicity is not yet robust enough to support binding water quality criteria. The Clean Water Act (CWA) screening levels , released June 10, set out what EPA sees as unsafe concentrations of both 6PPD and 6PPD-q for aquatic life,...