Isoprene photo-oxidation products quantify the effect of pollution on hydroxyl radicals over Amazonia - Liu, Yingjun; Seco, Roger; Kim, Saewung; Guenther, Alex B; Goldstein, Allen H; Keutsch, Frank N; Springston, Stephen R; Watson, Thomas B; Artaxo Netto, Paulo Eduardo; Souza, Rodrigo A F; McKinney, Karena A; Martin, Scot T (Science Advances, 2018)