Seattle Times: A warming planet may worsen air quality, although, it turns out, perhaps not everywhere. In the Pacific Northwest, levels of some pollutants might improve with climate change. Or get marginally worse. The Environmental Protection Agency (EPA) released early results Friday from several studies on how climate change might alter concentrations of ground-level ozone, the chief pollutant in smog. Smog could worsen in some places because the release of gases from plants and …