Process Engineering
Release date:
2020-07-17
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Wu Zunyou, chief epidemiologist at the Chinese Center for Disease Control and Prevention, said in response to the question of “when masks are unnecessary and when they are required” that as temperatures rise, more and more people are wearing masks. He added that, coupled with several student cases, public attention to this issue has grown even further. In principle, masks are not needed in well-ventilated spaces; as long as ventilation is adequate, it should be safe.
Wu Zunyou, chief epidemiologist at the Chinese Center for Disease Control and Prevention, said in response to the question of “when masks are unnecessary and when they are required” that as temperatures rise, everyone is wearing masks. He added that, given the growing public attention—especially in light of several student cases—people have become even more vigilant about this issue. In principle, masks are not needed in well-ventilated spaces; as long as ventilation is adequate, it should be safe.
Wu Zunyou said, let’s discuss situations where masks are not required. In spacious outdoor settings—such as playgrounds, parks, and streets with few people—masks are unnecessary; likewise, masks are not needed at home. In low-risk areas, wearing a mask is not required in offices, construction sites, factories, or similar workplaces. During outdoor activities, masks are also not necessary. For primary and secondary schools in low-risk areas, mask-wearing is not mandated. For individuals who rarely visit unfamiliar places, live in relatively stable environments, and reside in low-risk areas, this principle applies: under these circumstances, masks are generally not needed.
Regarding places where mask-wearing requires special attention, Wu Zunyou stated that in poorly ventilated, enclosed spaces—such as airplanes, high-speed trains, subways, and buses—closed‑type transportation should be used. Similarly, enclosed public venues like elevator lobbies with inadequate ventilation also warrant caution. Hospitals deserve particular care: when visiting a hospital or accompanying relatives and friends to see a doctor, masks must be worn throughout the hospital setting. Additionally, certain service counters—such as those at supermarkets and bank tellers—require mask‑wearing. As for mask‑use, there’s no need to overcomplicate matters; the key principle is to prioritize settings with low ventilation risk. As I mentioned earlier, special vigilance is needed in enclosed spaces, while other locations should be assessed on a case‑by‑case basis.
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