Story perspectives

Federal Court Weighs Salmon's Fate in Tire Chemical Lawsuit

1/27/2026

Summary

Story summary

A federal court in San Francisco is hearing a lawsuit against Bridgestone and Michelin over 6PPD.
Plaintiffs, supported by environmental groups, allege 6PPD forms 6PPD-quinone, a toxic byproduct harming salmon in California and Alaska.
Researchers testified that 6PPD-quinone can kill coho salmon quickly.
Tire companies counter that the science relies on lab conditions and real-world concentrations are lower.
Hearings resume January 28 and 29, with a ruling expected later.

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Story summary

A federal court in San Francisco is hearing a lawsuit against Bridgestone and Michelin over 6PPD.
Plaintiffs, supported by environmental groups, allege 6PPD forms 6PPD-quinone, a toxic byproduct harming salmon in California and Alaska.
Researchers testified that 6PPD-quinone can kill coho salmon quickly.
Tire companies counter that the science relies on lab conditions and real-world concentrations are lower.
Hearings resume January 28 and 29, with a ruling expected later.