A new study shows that stormwater runoff from urban roadways is so toxic to coho salmon that it can kill adult fish in as little as 2½ hours.

But the research by Seattle scientists also points to a relatively easy fix: Filtration through a simple, soil-based system.

“It’s basically … letting the Earth do what it does so well, what it has done for eons: cleaning things up,” said Julann Spromberg, a toxicologist for the National Oceanic and Atmospheric Administration and co-author of the report published Thursday in the Journal of Applied Ecology.

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