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LISTEN: Bigger, hotter wildfires are worsening air quality in the Northwest

caption: Smoke from an approaching wildfire looms over a home near Twisp, Wash., Aug. 19, 2015.
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Smoke from an approaching wildfire looms over a home near Twisp, Wash., Aug. 19, 2015.
AP Photo/Ted S. Warren

Kim Malcolm talks with University of Washington environmental chemistry professor Dan Jaffe about why air quality in the Pacific Northwest has been getting worse over the last three decades.

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