For the general public:

There is no need to wear masks at home, outdoors, places with good ventilation and no gathering of people.

Wear masks in crowded places, van elevators, and public vehicles. Carry masks with you in medium and low-risk areas and wear masks when others are at close range (less than 1m). Wear disposable medical masks in high-risk areas.

People suffering from cough or sneezing or living with home-quarantined people or discharged patients should wear disposable medical masks or surgical masks.

For people in specific places:

If you are in crowded hospitals, bus stations, railway stations, subway stations, airports, supermarkets, restaurants, public vehicles, and entrances and exits of communities and companies, wear disposable medical masks or surgical masks in medium and low-risk areas. Personnel should wear surgical masks or protective masks of KN95/N95 and above in high-risk areas.

If you are in prisons, nursing homes, welfare homes, mental health and medical institutions, classrooms, dormitories on construction sites and other crowded places, carry disposable medical masks or surgical masks with you and wear masks in crowded places or when others are at close range (less than 1m) in medium and low-risk areas. Personnel should wear surgical masks or protective masks of KN95/N95 and above in high-risk areas. Non-personnel should wear disposable medical masks.

Key personnel:

Suspected COVID-19 patients, confirmed patients, asymptomatic infected patients, close contacts with COVID-19 patients,  and entry personnel (from entry to the end of quarantine) should wear surgical masks or protective masks of KN95/N95 and above without exhalation valve.

People with occupational exposure:

The following personnel should wear surgical masks: medical personnel working in general out-patient clinics and wards, medical personnel working in low-risk areas, personnel engaging in epidemic prevention and control, personnel working in wards and ICU with confirmed cases and suspected cases, medical personnel working in fever clinics in designated medical institutions, medical personnel in emergency departments of medical institutions in medium and high-risk areas, epidemiological investigators, laboratory testing personnel, disinfection personnel, and personnel transferring confirmed or suspected patients.

The following personnel should wear hooded (or full-face) powered air supply and filtration respiratory protector, or semi-face powered air supply and filtration respiratory protector plus goggles or full-screen glasses (the two kinds of respiratory protectors should use P100 anti-particle filter component which should not be reused; the protector should be used only after disinfection): operators engaging in respiratory tract sample collection; personnel engaging in a tracheotomy, endotracheal intubation, bronchoscopy, sputum aspiration, cardiopulmonary resuscitation, lung transplantation, and pathological anatomy of COVID-19 patients.

Warnings!

• Respiratory protectors include gauze masks and masks. Wash hands before wearing and after removing them.

• Do not wear masks upside down or in a reversed way. The mask should cover the nose and mouth. Adjust the nose clip to make the mask fit the face.

• Do not touch the inside and outside of the mask when wearing the mask. Remove the mask by pulling off the strings at both ends.

• Wearing more than one masks cannot enhance the protective effect but increases respiratory resistance and may weaken tightness.

•  Do not reuse masks after cleaning or disinfecting them.

• Do not wear the same disposable medical masks and surgical masks for longer than 8 hours. Personnel with occupational exposure should not wear the same masks for more than 4 hours and the masks should not be reused.

对于普通公众：

居家、户外，无人员 聚集、通风良好的地方不需要戴口罩。

人员密集场所或乘坐厢式电梯、公共交通工具等：在中、低风险地区，应随身备用口罩，在于其他人近距离接触（小于1米）时戴口罩。在高风险地区，戴一次性医用口罩。

对于咳嗽或打喷嚏等感冒症状者、与居家隔离、出院康复人员共同生活的人：戴一次性医用口罩或医用外科口罩。

特定场所人员：

人员密集的医院、汽车站、火车站、地铁站、机场、超市、餐馆、公共交通工具以及社区和单位进出口等场所：在中、低风险地区，戴一次性医用口罩或医用外科口罩。在高风险地区，工作人员戴医用外科口罩或KN95/N95及以上级别的防护口罩。

监狱、养老院、福利院、精神卫生医疗机构、以及教室、工地宿舍等人员密集场所：在中、低风险地区，应随身备用口罩（一次性医用口罩或医用外科口罩），在于人员聚集或在于其他人近距离接触（小于1米）时戴口罩。在高风险地区，工作人员戴医用外科口罩或KN95/N95及以上级别的防护口罩； 其他人员戴一次性医用口罩。

重点人员：

新冠状病毒疑似病例、确诊病例和无症状感染者；新冠肺炎密切接触者；入境人员（从入境开始到隔离结束）：戴医用外科口罩或无呼气阀的KN95/N95及以上级别的防护口罩。

职业暴露人员：

普通门诊、病房等医务人员、低风险地区医务人员；从事疫情防控的人员；在确诊病例、疑似病例的病房、ICU工作的人员；制定医疗机构发热门诊的医务人员；中、高风险地区医疗机构急
诊科的医务人员；流行病学调查、实验室检测、环境消毒人员；转运确诊和疑似病例人员：戴医用外科口罩。

从事呼吸道标本采集的操作人员；进行新型冠状病毒肺炎患者气管切开、气管插管、气管镜检
查、吸痰、心肺复苏操作，或肺移植手术、病理解剖的工作人员： 头罩式（或全面型）动力送风过滤式呼吸防护器，或半面型动力送风过滤式呼吸防护器加戴护目镜或全面屏;两种呼吸防护器均需选用P100防颗粒物过滤元件，过滤元件不可重复使用，防护器具消毒后使用。

使用注意事项!

1、呼吸防护用品包括口罩和面具，佩戴前、脱除后应洗手。

2、佩戴口罩时注意正反和上下，口罩应遮 盖口鼻，调整鼻夹至贴合面部。

3、佩戴过程中避免用手触摸口罩内外侧，应通过摘取两端线绳脱去口罩。

4、佩戴多个口罩不能有效增加防护效果，反而增加呼吸阻力，并可能破坏密合性。

5、各种对口罩的清洗、消毒等措施均无证据证明其有效性。

6、一次性使用医用口罩和医用外科口罩均为限次使用，累计使用不超过8小时。职业暴露人员使用口罩不超过4小时，不可重复使用。

（Executive Editor: Ye Ke, Feng Siyuan)