Emerging chemical threat in waterways can be deadly to salmon, trout

Most people depend on their cars to transport them to their outdoor destinations. And despite widely publicized, spirited debates regarding the merits of electric powertrains and autonomous driving, for the foreseeable future, those cars will still have tires.
Perhaps lesser know is that the rubber in those tires contains a chemical called N-(1,3- dimethylbutyl)-N’-phenyl-pphenylenediamine, or 6PPD for short. The chemical 6PPD is used by tire manufacturers to extend a tire’s life but as a tire wears, it leaves behind small rubber particles containing 6PPD which, after a heavy rain, can wash into rivers and streams and transform into a compound called 6PPD-quinone – a compound that studies have shown to be deadly to coho salmon in the northwestern United States.

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