http://www.sciencemag.org/news/2019/04/drought-not-just-about-water-it-affects-air-pollution-too > A lengthy California drought left trees and plants parched and influenced their contributions to smog. > The severe drought that struck California from 2011 to 2015 had an obvious impact on rivers, forests, and wildlife. Now, a new study shows it also had some surprising effects on the state’s notorious air pollution, adding new wrinkles to the state’s efforts to clear the skies.