Washington State Department of Ecology

6PPD State of the Science Forum (Day 1) · December 9, 2025

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Opening remarks and forum goals

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Tanya Williams (host) opened the forum, summarized the 2020 discovery that 6PPD quinone is a causal explanation for coho salmon pre‑spawn mortality, and described the forum's goals: share emerging science, policy actions, and connect research and management networks.

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Researchers and agency staff at the Day 1 sessions of the 6PPD State of the Science Forum reviewed mounting evidence that 6PPD quinone from tire wear is widespread in stormwater, lethal to sensitive salmon at extremely low concentrations, and that targeted monitoring and green-infrastructure treatments can reduce exposures.

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Transcript

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