With every rainfall, fish and other critters living downstream of storm drains are exposed to hundreds of pollutants in runoff, including materials and chemicals used in vehicle fluids, tires and paints
We’ve survived the first rainfall of the season. We handled the slippery conditions created by oil, chemicals and dust that accumulated on road surfaces during the recent 10 weeks of drought. The rain washed those materials away.With every rainfall, fish and other critters living downstream of storm drains are exposed to hundreds of pollutants in runoff, including materials and chemicals used in vehicle fluids, tires and paints.
And recent work out of the University of British Columbia Okanagan suggests that more than 50 tonnes of microplastics from tires and roadways are being released every year into waterways in regions such as the Okanagan. Scientists now know that tire particles are one of the most common microplastic types in aquatic ecosystems. During the lifetime of a vehicle tire, about 30 per cent of its tread erodes and enters the environment.
In two recent studies, Oregon researchers determined that tire particles and their leachate inhibit growth and caused fish, shrimp and other crustaceans found in freshwater and coastal estuary ecosystems to behave differently. 6PPD is added to tire rubber to keep it from breaking down quickly. The chemical protects tires from ozone, a highly reactive molecule created when vehicle and other chemical emissions react in sunlight. Ozone busts the molecular bonds holding tire rubber together, and 6PPD protects tires by binding with ozone before it can react with the tire rubber, thereby sparing the tires.
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