1. Sensitivity of the NOy budget over the United States to anthropogenic and lightning NOx in summer Fang, Yuanyuan; Fiore, Arlene M.; Horowitz, L. W.; Levy II, H.; Hu, Y.; Russell, A. G. 2010 Articles Climatic changes--Effect of human beings onNitrogen oxides--Environmental aspectsLightningTropospheric chemistryGeochemistryClimatic changesAtmospheric chemistry