Medical masks and surgical masks are sufficient for normal use, and wearing multiple masks does not provide more protection, according to the guideline.
指引指出，医用口罩或医用外科口罩可用于一般防护，佩带多个口罩并不能添加防护作用。
指引对一般大众（general public）、特定场所人员（people at specific areas）、要点人员（key population groups）以及作业露出人员（people with occupational exposure）进行分类，并对不同场景下戴口罩提出科学主张。
这些状况不主张戴口罩
一般大众在居家（stay at home）、野外（outdoors），无人员集合（no crowds）、通风杰出（well-ventilated）的状况下，主张不佩带口罩。
这些状况佩带一次性口罩
The public is advised to carry along masks when in crowded places such as offices, shopping malls, restaurants, workshops and public transport. People in high-risk areas should wear surgical masks all the time when entering such places, while those in medium-risk and low-risk areas need to wear medical masks when in contact with others at the distance of less than 1 meter.
一般大众处于如作业、购物、餐厅、车间、公共交通工具等人员密布场所时，在中、低危险区域，应随身备用口罩，在与其别人近距离触摸（小于等于1米）时戴口罩。在高危险区域，戴一次性运用医用口罩。
Those who have cold symptoms such as coughing or sneezing, or who live with personnel in quarantine or that have recovered from the novel coronavirus and been discharged from the hospital, are suggested to wear disposable medical or surgical masks.
关于咳嗽或打喷嚏等伤风症状者，主张戴一次性运用医用口罩或医用外科口罩。关于与居家阻隔、出院恢复人员共同生活的人员，主张戴一次性运用医用口罩或医用外科口罩。
这些状况主张佩带防护口罩
People working in places such as hospitals, train terminals, airports, prisons and nursing homes need to wear surgical masks or respirators of grade KN95/N95 or above.
医院、火车站、机场、监狱、养老院等人员密布场所作业人员，主张戴医用外科口罩或契合KN95/N95及以上等级的防护口罩。
The suspected cases, confirmed cases of novel coronavirus, asymptomatic cases and those who have close contact with confirmed cases are recommended to wear surgical masks or respirators with no breathing valve graded at KN95/N95 or above. Entry personnel need to wear such masks from the moment they enter the country to the end of their required quarantine.
新式冠状病毒肺炎疑似病例、确诊病例和无症状感染者；新式冠状病毒肺炎密切触摸者；入境人员(从入境开端到阻隔完毕)，戴医用外科口罩或无呼气阀契合KN95/N95及以上等级的防护口罩。
作业露出人员依据作业内容及地址不同，佩带医用外科口罩、医用防护口罩或送风过滤式呼吸防护器。
【相关词汇】
带呼吸阀的防护口罩 valved respirator
一次性口罩 disposable mask
防护物资 protective materials
护目镜 protective eyewear
