In June 2013, President Obama released his Climate Action Plan. The Plan calls for a range of activities to help mitigate the impacts of carbon pollution, prepare for and adapt to those impacts that cannot be avoided, and enhance international efforts to reduce the harmful global effects of climate change. Success in each of the Plan's three components will require access to and application of the highest quality atmospheric science. Fortunately, as a result of decades of attention to the issue of air quality generally - from ozone and carbon dioxide to soot and other particulates - the...