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Policymakers and homeowners are scrambling to manage so-called 'wildland-urban interface' to mitigate the threat.

A new study concludes that climate-boosted wildfires are significantly altering carbon monoxide levels in the region — and the effects reach far beyond the Cascades.

Storm-related sewage spills dump about 93 million gallons of chemical discharge a year into Puget Sound.

Environmentalists call the decision a ‘watershed moment,’ as concerns about groundwater pollution mount in Yakima Valley and Whatcom County.

Unprecedented temperatures recall a 2015 heat wave that killed 99% of salmon returning to one stretch of the Snake River.

U.S. Fish and Wildlife Service considers listing Mt. Rainier ptarmigan on the federal endangered species list.