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In December 2025, heavy rains in the Portland Metro area activated a lethal chemical reaction, releasing 6PPD-quinone from the freeway system into critical salmon habitats, leading to significant ecological harm. The combination of continuous toxicity and regulatory failures resulted in a catastrophic decline of the Coho salmon population, with up to 30% of the run facing pre-spawn mortality. The situation is exacerbated by stagnant water conditions in the Columbia Slough, creating a chemical trap for juven

Author

Jesse J

Language

EN