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Seattle: When it rains, it pollutes

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When rain falls in undeveloped areas, the water is absorbed and filtered by soil and plants. But in built-up cities like Seattle, the water washes over roofs, roads and pavements, picking up a cocktail of pollutants on its way: petrol, tyre particles, heavy metals, pesticides and even animal excrement. Most of it ends up passing directly into the Puget Sound, transforming the city's waterway into a toxic home for marine life.

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This week Down to Earth meets a diver, filmmaker and now activist championing local efforts to save Seattle's Puget Sound.

Also, a leading aquatic ecotoxicologist at Washington State University explains why coho salmon are an important sentiRead More – Source

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