Peredes, M., R. Viteri, D. Auqui, and D. Idrovo. 2019. “Determining NO2 Immission Levels in a Conflicted Area: Riobamba, Ecuador”. Scientific Review Engineering and Environmental Sciences (SREES) 28 (3):465–475. https://doi.org/10.22630/PNIKS.2019.28.3.43.