The weekend pedestrian mall around Hoan Kiem Lake and the Old Quarter in Hanoi has been welcoming large crowds of city-dwellers since the second COVID-19 outbreak was largely contained. Excited to breathe in fresh air with their fellow Hanoians, many people forgot to wear face masks. People even forget to wear face masks when visiting hospitals, where the risk of infection is always high. According to the National Steering Committee for COVID-19 Prevention and Control, the risk of COVID-19 transmission still remains from people arriving in Vietnam from overseas, while some people who have it don’t show any symptoms. According to experts, wearing a face mask in public is effective in preventing the spread of COVID-19. Underestimating this has made many countries pay a high price. It’s therefore necessary for people to be more responsible about wearing face masks, not only to protect their own health but also the health of others./.