A citizen wearing a face mask and another wearing a respirator walk on the street in downtown Vancouver, Canada, April 4, 2020. (Photo by Liang Sen/Xinhua)

A man puts on a respirator while skateboarding on the street in downtown Vancouver, Canada, April 4, 2020. (Photo by Liang Sen/Xinhua)

A man covers his face with a scarf on the street in downtown Vancouver, Canada, April 4, 2020. (Photo by Liang Sen/Xinhua)

A mounted police officer on duty is seen at a trail in Toronto, Canada, April 4, 2020. Providing public education and enforcing physical distancing measures, the Toronto Police Service took part in an enforcement blitz on Saturday in busy parks and areas to reduce the spread of COVID-19. (Photo by Zou Zheng/Xinhua)

Police officers on duty are seen at a trail in Toronto, Canada, April 4, 2020. Providing public education and enforcing physical distancing measures, the Toronto Police Service took part in an enforcement blitz on Saturday in busy parks and areas to reduce the spread of COVID-19. (Photo by Zou Zheng/Xinhua)