Tropospheric and Surface Nitrogen Dioxide Changes in the Greater Toronto Area during the First Two Years of the COVID-19 Pandemic. - Xiaoyi Zhao; Vitali Fioletov; Ramina Alwarda; Yushan Su; Debora Griffin; Dan Weaver; Kimberly Strong; Alexander Cede; Thomas Hanisco; Martin Tiefengraber; Chris Anthony McLinden; Henk Eskes; et al. (Remote. Sens., 2022)