The global outbreak and spread of COVID-19 had a significant impact on the environment of urban areas . This study aimed to provide a new insight into the urban transportation and air pollutant emission of representative Canadian cities impacted by this pandemic . The consumption of urban transportation fuel was analyzed and the corresponding CO2 emissions was evaluated . The changes in urban traffic volume and air pollutant concentrations before and after the outbreak of this pandemic was investigated . Due to the lockdown after the outbreak of COVID-19, the domestic consumption of motor gasoline and estimated CO2 emissions from urban vehicles in Canada has continuously decreased with a lowest level in April 2020, and rebounded in May 2020 . It will still take a long time to recover to pre-pandemic levels because of the upcoming second wave of pandemic and further change . The Air Quality Health Index (AQHI), level of urban congestion and concentration level of NO2 and CO had strong relevance with the COVID-19 period while SO2 did not show significant relation . The comprehensive analysis of changing fuel consumptions, traffic volume and emission levels can help the government assess the impact and make corresponding strategy for such a pandemic in the future.