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The Don River releases 500 billion microplastics yearly into Lake Ontario, mainly from construction foam, tires, and degraded plastics.
The Don River in Toronto releases about 500 billion microplastic particles—equivalent to 36,000 kilograms—into Lake Ontario each year, far surpassing larger plastic debris.
A peer-reviewed study led by University of Toronto’s Chelsea Rochman found microplastics come from construction foam, tires, plastic pellets, and degraded single-use items like bags and wet wipes.
Measurements before, during, and after storms showed no spike in pollution, suggesting the river could recover if sources are eliminated.
Experts urge better waste management, infrastructure upgrades, and bans on certain plastics, as Toronto invests $3 billion to reduce sewer overflows.
El río Don libera anualmente 500 mil millones de microplásticos al lago Ontario, principalmente de espuma de construcción, neumáticos y plásticos degradados.