Peredes, M., Viteri, R., Auqui, D. and Idrovo, D. 2019. Determining NO2 immission levels in a conflicted area: Riobamba, Ecuador. Scientific Review Engineering and Environmental Sciences (SREES). 28, 3 (Sep. 2019), 465–475. DOI:https://doi.org/10.22630/PNIKS.2019.28.3.43.