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Scientists at forum say 6PPD quinone from tire wear is widespread in urban runoff and lethal to salmon
Summary
Researchers at the 6PPD State of the Science Forum summarized laboratory and field evidence that 6PPD quinone forms from tire wear, spikes during storms, and can kill coho and other sensitive salmon at parts‑per‑trillion to nanogram‑per‑liter concentrations; they urged targeted monitoring and prioritized green‑infrastructure responses.
Researchers, agency staff and community scientists attending Day 1 of the 6PPD State of the Science Forum described growing evidence that 6PPD quinone — a transformation product of the tire additive 6PPD — forms in road runoff and can produce acute kills in salmon at extremely low concentrations.
The forum opened with a brief history: "In 2020, researchers in the Pacific Northwest identified 6PPD quinone as the long‑sought cause of coho salmon deaths during spawning runs," host Tanya Williams said. Presenters then summarized laboratory dose‑response work and field monitoring showing short, high‑magnitude pulses of 6PPD quinone during storms.
Nathan Ivy, a…
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