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The wearing of face masks during the COVID-19 pandemic has received varying recommendations from different public health agencies and governments. The topic has been a subject of debate, with various public health agencies and governments disagreeing on a protocol for wearing face masks. As of early May 2020, 88% of the world's population lives in countries that recommend or mandate the use of masks in public; more than 75 countries have mandated the use of masks. Debates have emerged regarding whether masks should be worn even when social distancing at 2 meters (6 feet), and whether they should be worn during exercise. Additionally, public health agencies of some countries and territories have changed their recommendations regarding face masks over time. Face masks have been a subject of shortages, and not all have been certified. Moreover, substandard masks were reported on the market with significantly reduced performance .

Types of face masks include:

• cloth face masks
• medical (non-surgical) masks,
• surgical masks
• filtering facepiece respirators such as N95 masks and FFP masks

Face shields, medical goggles, and other types of personal protective equipment are sometimes used together with face masks.

Types of masks

Certified medical masks are disposable (except some faceshields). They are made of non-woven material. They are mostly multi-layer. Filter material may be made of microfibers with an electrostatic charge; that is, the fibers are electrets. An electret filter increases the chances that smaller particles will veer and hit a fiber, rather than going straight through (electrostatic capture). Typically, efficiency of the filtering materials decreases when washed or used multiple times.

Many medical masks are respirators; they are designed to protect the wearer. Surgical masks, on the other hand, are meant to protect others against infection transmission from the wearer (so called "source control"). Some respirators and masks have valves, which let exhaled air out unfiltered. This makes them bad for source control. It may, however, reduce inwards leakage, thus improving wearer protection.

Face shields

It is not yet known whether face shields are effective at preventing disease transmission. They protect against splash and splatter. Cough simulation experiments show that they protect the wearer against large drops immediately after the cough, but do not keep out smaller aerosols. The longer it was after the simulated cough, the more particles found their way around. Because there is no evidence they prevent the wearer from getting ill, face shields are used with nose-mouth masks, and to protect nose-mouth masks, but use of face shields alone is not recommended.

Cloth masks

A cloth face mask is a mask made of a common textile, usually cotton, worn over the mouth and nose. Although they are less effective than medical-grade masks, many health authorities recommend that the general public use them because medical-grade masks are in short supply.

They were routinely used by healthcare workers starting from the late 19th century until the mid 20th century. In the 1960s they fell out of use in the developed world in favor of modern surgical masks, but their use has persisted in developing countries.

There were calls for research into the effectiveness of improvised masks even before the emergence of COVID-19, motivated also by past epidemics and modelling of likely mask shortages. However, little research has been done. There are no studies of the use of cloth masks by the general public, one study on the use of cloth masks in hospitals (by healthcare workers, not patients), and many controlled-setting/lab studies of cloth masks' effects on aerosols as of May 2020.

Cloth masks are low-cost and reusable. They vary widely in effectiveness depending on material, fit/seal, and number of layers, among other factors. Unlike disposable masks, there are no legal standards for cloth masks. Fit is important (as with disposable masks). Measures to improve fit, such as an outer layer made from sheer nylon stockings or sheer tights around the head, reduce leakage.

Improvised cloth masks seem to be worse than standard commercial disposable masks, but better than nothing. There is, however, little good evidence on them. A single study gives evidence that an improvised mask was better than nothing, but not as good as soft electret-filter surgical mask, for protecting health care workers simulating treating a simulated infected patient, regardless of whether "patient" or carers wore the mask. Another study had volunteers wear masks they made themselves, to a pattern like that of a standard surgical mask, but with ties rather than earloops, from cotton T-shirts, and found that the number of microscopic particles that leaked inside the homemade masks was twice the number that leaked into the commercial masks, and that the homemade mask let three times as many microorganisms expelled by the wearer escape (median averages). There is limited evidence that cloth masks can significantly reduce droplet dispersal.

Cloth masks are commonly made with one layer, two layers, or two layers with a pocket for a removable-filter interlayer (disposable surgical mask also have three layers, with the filter layer midmost). The CDC recommends more than one layer. There is no research on the usefulness of a filter interlayer, as of May 2020. There were until recently no non-disposable materials designed for making masks (see end of paragraph). Common household fabrics which could be utilized (turned to a new use) as mask materials have been tested. Cloth materials vary widely in filtration efficiency. Some cotton and polyester household fabrics have been found to compare with disposable surgical masks for dry particle filtering. Cotton T-shirt material, pillowcase material, and 70% cotton/30% polyester sweatshirt material are among the common materials that performed well in lab tests, with T-shirts preferred to pillowcases because it was thought that it would probably fit better. Teatowels and vacuum-cleaner bags were effective at filtering, but had a very high air resistance, so were not recommended. Scarves filtered poorly. Surgical sterilisation wrap, a polypropylene non-woven fabric made for wrapping sterilized things to keep them sterile, is designed to filter germs from the air. Using surgical sterilisation wrap to make masks, or as a filter interlayer in cloth masks, has been suggested. There are, however, no tests on using surgical sterilisation wrap for masks, as of May 2020.

Other suggested materials for filter interlayers include air filter materials used in ventilation, heating, and air conditioning, some of which are similar to rigid electret masks in the size ranges of particles they filter. Electrostatic cotton and non-woven, meltblown fabric are the conventional materials used in disposible masks, but are not readily available during the COVID-19 epidemic. A new type of filter, a washable electrostatic cotton filter, has been reported since the start of the pandemic; it is said to withstand repeated washing and folding. It is made of electrospun nanofibers; flanking insulating blocks lay these into quasi-aligned nonwoven sheets, which are layered criss-cross to make a meshlike multilayer mask. There is a need for research comparing how well these materials work.

Sterilizing and re-use

There is no research on sterilizing and reusing cloth masks, as of May 2020. The CDC recommends doffing the mask by handling only the ear loops or ties, placing it directly in a washing machine, and immediately washing your hands in soap and water for at least 20 seconds. They also recommend handwashing before donning the mask and again immediately after any time you touch it.

There is no information on reusing a interlayer filter, and disposing of it after a single use may be desirable.

Surgical masks

A surgical mask is a loose-fitting, disposable device that creates a physical barrier between the mouth and nose of the wearer and potential contaminants in the immediate environment. If worn properly, a surgical mask is meant to help block large-particle droplets, splashes, sprays, or splatter that may contain viruses and bacteria, keeping it from reaching the wearer's mouth and nose. Surgical masks may also help reduce exposure of the wearer's saliva and respiratory secretions to others. A surgical mask, by design, does not filter or block very small particles in the air that may be transmitted by coughs, sneezes, or certain medical procedures. Surgical masks also do not provide complete protection from germs and other contaminants because of the loose fit between the surface of the face mask and the face. However, in practice, with respect to some infections like influenza surgical masks appear as effective as respirators (such as N95 or FFP masks). Surgical masks may be labeled as surgical, isolation, dental, or medical procedure masks. Surgical masks are made of a nonwoven fabric created using a melt blowing process.

Surgical masks made to different standards in different parts of the world have different ranges of particles which they filter. For example, China regulates two types of such masks: single-use medical masks (Chinese standard YY/T 0969) and surgical masks (YY 0469). The latter ones are required to filter bacteria-sized particles (BFE ≥ 95%) and some virus-sized particles (PFE ≥ 30%), while the former ones are required to only filter bacteria-sized particles.

Disposable filtering respirators

An N95 mask is a particulate-filtering facepiece respirator that meets the N95 air filtration rating of the US National Institute for Occupational Safety and Health, meaning that it filters at least 95 percent of airborne particles, while not resistant to oil like the P95. It is the most common particulate-filtering facepiece respirator. It is an example of a mechanical filter respirator, which provides protection against particulates, but not gases or vapors. Like the middle layer of surgical masks, the N95 mask is made of four layers of melt-blown nonwoven polypropylene fabric. The corresponding face mask used in the European Union is the FFP2 respirator.

Hard electret-filter masks like N95 and FFP masks must fit the face to provide full protection. Untrained users often get a reasonable fit, but fewer than one in four gets a perfect fit. Fit testing is thus standard. A line of vaseline on the edge of the mask has been shown to reduce edge leakage in lab tests using manikins that simulate breathing.

Sterilizing and re-use

Hard electret-filter masks are designed to be disposable, for 8 hours of continuous or intermittent use. One laboratory found that there was a decrease in fit quality after five consecutive donnings.

Hard electret-filter masks are often reused, especially during pandemics when there are shortages. Infectious particles could survive on the masks for up to 24 hours after the end of use, according to studies using models of SARS-CoV-2; In the COVID-19 epidemic, the US CDC recommended that if masks run short, each health care worker should be issued with five masks, one to be used per day, such that each mask spends at least five days stored in a paper bag between each use. If there are not enough masks to do this, they recommend sterilizing the masks between uses. Some hospitals have been stockpiling used masks as a precaution. The US CDC issued guidelines on stretching N95 supplies, recommending extended use over re-use. They highlighted the risk of infection from touching the contaminated outer surface of the mask, which even professionals frequently unintentionally do, and recommended washing hands every time before touching the mask. To reduce mask surface contamination, they recommended face shields, and asking patients to wear masks too ("source masking").

Apart from time, other methods of disinfection have been tested. Physical damage to the masks has been observed when microwaving them, microwaving them in a steam bag, letting them sit in moist heat, and hitting them with excessively high doses of ultraviolet germicidal irradiation (UVGI). Chlorine-based methods, such as chlorine bleach, may cause residual smell, offgassing of chlorine when the mask becomes moist, and in one study, physical breakdown of the nosepads, causing increased leakage. Fit and comfort do not seem to be harmed by UVGI, moist heat incubation, and microwave-generated steam.

Some methods may not visibly damage the mask, but they ruin the mask's ability to filter. This has been seen in attempts to sterilize by soaking in soap and water, heating dry to 160°C, and treating with 70% isopropyl alcohol, and hydrogen peroxide gas plasma (made under a vacuum with radio waves). The static electrical charge on the microfibers (which attracts or repels particles passing through the mask, making them more likely to move sideways and hit and stick to a fiber) is destroyed by some cleaning methods. UVGI (ultraviolet light), boiling water vapour, and dry oven heating do not seem to reduce the filter efficiency, and these methods successfully decontaminate masks.

UVGI (an ultraviolet method), ethylene oxide, dry oven heating and (highly toxic) vaporized hydrogen peroxide are currently the most-favoured methods in use in hospitals, but none have been properly tested. Where enough masks are available, cycling them and reusing a mask only after letting it sit unused for 5 days is preferred.

Elastomeric respirators

Elastomeric respirators are reusable devices with exchangeable cartridge filters that offer comparable protection to N95 masks. They were used as a substitute for N95 masks among shortages during the COVID-19 pandemic.

The filters must be replaced when soiled, contaminated, or clogged. These components may be hard to find amidst shortages; the filters may thus be sterilized, in a way that does not harm the filter, and re-used. In medical use, they must be cleaned and disinfected, as some germs can survive on them for weeks.

Full-face versions of elastomeric respirators seal better and protect the eyes. If they have exhalation valves, then they are counterrecommended in settings where the unfiltered exhaled air might infect others (for instance, surgery). Fitting and inspection is essential to effectiveness.

Powered air-purifying respirators (PAPRs)

PAPRs are expensive masks with a battery-powered blower that blows air through a filter to the wearer. Because they create positive pressure, they need not be tightly-fitted. PAPRs typically do not filter exhaust from the wearer. They are not generally designed for healthcare use, as of 2017.

Novel face masks (research and development)

On 15 April 2020 scientists claimed to have developed a biodegradable material for face masks which is effective at removing particles smaller than 100 nanometres including viruses and has a high breathability. Two Israeli companies reportedly have developed antiviral face masks – one of which is infused with antiviral copper oxide and zinc oxide nanoparticles, the other is made out of cotton embedded with accelerated copper oxide particles and a nanofiber textile. Other Israeli researchers have developed a 3D-printed nanoscale fiber sticker coated with antiseptics which can be attached to a traditional mask for extra protection. Other reseachers report that laser-induced graphene may be used to add self-cleaning and photothermal properties to face masks. In March 2020 Jiaxing Huang became the first scientist to receive a $200,000 grant by the United States' National Science Foundation to develop a chemical which can be safely built into common face masks to make them protect against SARS-CoV-2 and self-sanitize passing droplets.

Recommendations

Health organizations have recommended that people cover their mouth and nose with a bent elbow or a tissue when coughing or sneezing, and dispose of any tissue immediately. Surgical masks are recommended for those who may be infected, as wearing a mask can limit the volume and travel distance of expiratory droplets dispersed when talking, sneezing, and coughing.

Masks have also been recommended for use by those who are taking care of someone who may have the disease. The WHO has recommended the wearing of masks by healthy people only if they are at high risk, such as those who are caring for a person with COVID-19, though they also acknowledge that wearing masks may help people avoid touching their face. Several countries have started to encourage the use of face masks by members of the public.

As of May 2020, 88% of the world's population lived in countries where their government and leading disease experts recommended the use of masks in public places to limit the spread of COVID-19.

World Health Organization

World Health Organization advice to the public in the context of COVID-19 endorsed the use of masks only under the following conditions:

• If you are healthy, you only need to wear a mask if you are taking care of a person with suspected 2019-nCoV infection.
• Wear a mask if you are coughing or sneezing.
• Masks are effective only when used in combination with frequent hand-cleaning with alcohol-based hand sanitizer or soap and water.
• If you wear a mask, then you must know how to use it and dispose of it properly.

— World Health Organization

In January 2020, there was no evidence on whether masks were useful for people who were not sick in a community setting.

US Centers for Disease Control and Prevention

The United States Centers for Disease Control and Prevention (CDC) recommended in April 2020 that the general public wear cloth face coverings in public settings where other social distancing measures are difficult to maintain, such as grocery stores and pharmacies, especially in areas of significant community-based transmission, due to the significance of asymptomatic and pre-symptomatic disease transmission.

In March 2020, the CDC recommended that if neither respirators nor surgical masks are available, as a last resort, it may be necessary for healthcare workers to use masks that have never been evaluated or approved by NIOSH or homemade masks, though caution should be exercised when considering this option.

The CDC faced backlash over earlier advice that most healthy people did not need to wear a mask. When asked by National Public Radio about the April 3 reversal, the CDC cited studies from February and March showing presymptomatic and asymptomatic transmission. Professor of public health Larry Gostin said that the CDC could have revised its recommendation sooner; by maintaining its initial recommendation throughout March, it had given the public the impression that widespread mask usage was ineffective even though scientific evidence to the contrary was already available. The earlier recommendation damaged the agency's credibility.

China and Asia

China has specifically recommended the use of disposable non-surgical medical masks by healthy members of the public, particularly when coming into close contact (1 metre (3 ft) or less) with other people. Hong Kong recommends wearing a surgical mask when taking public transport or in crowded places. Thailand's health officials are encouraging people to make cloth face masks at home and wash them daily. The Taiwanese, South Korean, and Japanese governments have also recommended the use of face masks in public.

When asked about the mistakes that other countries were making in the pandemic in March, the Chinese Center for Disease Control and Prevention director-general George Fu Gao said:

"The big mistake in the U.S. and Europe, in my opinion, is that people aren't wearing masks. This virus is transmitted by droplets and close contact. Droplets play a very important role − you've got to wear a mask, because when you speak, there are always droplets coming out of your mouth. Many people have asymptomatic or presymptomatic infections. If they are wearing face masks, it can prevent droplets that carry the virus from escaping and infecting others."

Rationale for wearing masks

Among the reasons cited by Chinese health officials for the wearing of masks, even by healthy individuals, are the following:

1. Asymptomatic transmission. Many people can be infected without symptoms or only with mild symptoms.
2. Impossibility of appropriate social distancing in many public places at all times.
3. Cost-benefit mismatch. If only the infected individuals wear a mask, they would possibly have a negative incentive to do so. An infected individual might get nothing positive, but only bear the costs such as inconvenience, purchasing expenses, and even prejudice.
4. There is no shortage of masks in China, which has been producing 100 million masks per day since early March.

Leading microbiologist Yuen Kwok-yung from the University of Hong Kong cites a large viral load in sputum and saliva of an infected person and asymptomatic cases as the reasons why even healthy individuals should wear a mask.

According to Stephen Griffin, a virologist at the University of Leeds, "Wearing a mask can reduce the propensity people to touch their faces, which is a major source of infection without proper hand hygiene." The precautionary principle has also been cited by the British Medical Journal as a reason some may encourage universal face mask wearing.

Asian health officials and experts have been promoting universal masking. For instance, Linfa Wang (a leading infectious disease expert who heads a joint Duke University and National University of Singapore research team) stated that masking is about "preventing the spread of disease rather than preventing getting the disease", remarking that the point is to cover the faces of people who are infected but do not know it, so it is imperative for everyone to wear one in public.

Studies beginning in the 2000s suggested that the required six feet of social distancing is insufficient and based on debunked studies from the 1930s or error.

Shortages of face masks

Early epidemic in China

As the epidemic accelerated, the mainland market in China saw a shortage of face masks due to increased public demand. In Shanghai, customers had to queue for nearly an hour to buy a pack of face masks; stocks were sold out in another in half an hour. Hoarding and price gouging drove up prices, so the market regulator said it would crack down on such acts. In January 2020, price controls were imposed on all face masks on Taobao and Tmall. Other Chinese e-commerce platforms – JD.com, Suning.com, Pinduoduo – did likewise; third-party vendors would be subject to price caps, with violators subject to sanctions.

By March China had quadrupled its production capacity (100 million masks per day).

National stocks and shortages

At the beginning of the COVID-19 outbreak in the United States, the U.S.'s Strategic National Stockpile contained just 12 million N95 respirators, far fewer than estimates of the amount required. Millions of N95s and other supplies were purchased from 2005 to 2007 using congressional supplemental funding, but 85 million N95s were distributed to combat the 2009 swine flu pandemic, and Congress did not make the necessary appropriations to replenish stocks. The Stockpile's primary focus has also primarily been on biodefense (defense against a terrorist or weapon of mass destruction attack) and response to natural disaster, with infectious disease a secondary focus. By 1 April 2020, the Stockpile was nearly emptied of protective gear. In January and February 2020, U.S. manufacturers, with the encouragement of the Trump administration, shipped millions of face masks and other personal protective equipment to China, a decision that subsequently prompted criticism given the mask shortage that the U.S. faced during the pandemic.

In France, 2009 H1N1-related spending rose to €382 million, mainly on supplies and vaccines, which was later criticised. It was decided in 2011 to not replenish its stocks and rely more on supply from China and just-in-time logistics. In 2010, its stock included 1 billion surgical masks and 600 million FFP2 masks; in early 2020 it was 150 millions and zero, respectively. While stocks were progressively reduced, a 2013 rationale stated the aim to reduce costs of acquisition and storage, now distributing this effort to all private enterprises as an optional best practice to ensure their workers' protection. This was especially relevant to FFP2 masks, more costly to acquire and store. As the COVID-19 pandemic in France took an increasing toll on medical supplies, masks and PPE supplies ran low, causing national outrage. France needs 40 millions masks per week, according to French president Emmanuel Macron. France instructed its few remaining mask-producing factories to work 24/7 shifts, and to ramp up national production to 40 million masks per month. French lawmakers opened an inquiry on the past management of these strategic stocks. The mask shortage has been called a "scandal d'État" (State scandal).

In late-March/early-April 2020, as Western countries were in turn dependent on China for supplies of masks and other equipment, China was seen as making soft-power play to influence world opinion. However, a batch of masks purchased by the Netherlands was reportedly rejected as being sub-standard. The Dutch health ministry issued a recall of 600,000 face masks from a Chinese supplier on 21 March which did not fit properly and whose filters did not work as intended despite them having a quality certificate. The Chinese Ministry of Foreign Affairs responded that the customer should "double-check the instructions to make sure that you ordered, paid for and distributed the right ones. Do not use non-surgical masks for surgical purposes". Eight million of 11 million masks delivered to Canada in May also failed to meet standards.

N95 and FFP masks

N95 and FFP masks were in short supply and high demand during the COVID-19 pandemic. Production of N95 masks was limited due to constraints on the supply of nonwoven polypropylene fabric (which is used as the primary filter), as well as the cessation of exports from China. China controls 50 percent of global production of masks, and facing its own coronavirus epidemic, dedicated all its production for domestic use, only allowing exports through government-allocated humanitarian assistance.

In March 2020, US President Donald Trump applied the Defense Production Act against the American company 3M, which allows the Federal Emergency Management Agency to obtain N95 respirators from 3M. White House trade adviser Peter Navarro stated that there were concerns that 3M products were not making their way to the US. 3M replied that it has not changed the prices it charges, and was unable to control the prices its dealers or retailers charge.

In early April 2020, Berlin politician Andreas Geisel alleged that a shipment of 200,000 N95 masks that it had ordered from American producer 3M's China facility were intercepted in Bangkok and diverted to the United States. Berlin police president Barbara Slowik stated that she believed "this is related to the US government's export ban." 3M said they had no knowledge of the shipment, stating "We know nothing of an order from the Berlin police for 3M masks that come from China," and the US government denied that any confiscation had taken place and said that they use appropriate channels for all their purchases.

Berlin police later confirmed that the shipment was not seized by US authorities, but was said to have simply been bought at a better price, widely believed to be from a German dealer or China. This revelation outraged the Berlin opposition, whose CDU parliamentary group leader Burkard Dregger accused Geisel of "deliberately misleading Berliners" in order "to cover up its own inability to obtain protective equipment". FDP interior expert Marcel Luthe said "Big names in international politics like Berlin's senator Geisel are blaming others and telling US piracy to serve anti-American clichés." Politico Europe reported that "the Berliners are taking a page straight out of the Trump playbook and not letting facts get in the way of a good story." The Guardian also reported that "There is no solid proof Trump approved the heist".

Jared Moskowitz, head of the Florida Division of Emergency Management, accused 3M of selling N95 masks directly to foreign countries for cash, instead of the US. Moskowitz stated that 3M agreed to authorized distributors and brokers to represent they were selling the masks to Florida, but instead his team for the last several weeks "get to warehouses that are completely empty." He then said the 3M-authorized US distributors later told him the masks Florida contracted for never showed up because the company instead prioritized orders that came in later, for higher prices, from foreign countries (including Germany, Russia, and France). As a result, Moskowitz highlighted the issue on Twitter, saying he decided to "troll" 3M. Forbes reported that "roughly 280 million masks from warehouses around the US had been purchased by foreign buyers and were earmarked to leave the country, according to the broker — and that was in one day", causing massive critical shortages of masks in the US.

As more and more countries restricted the export of N95 masks, Novo Textiles in British Columbia announced plans to start producing N95 masks in Canada. AMD Medicom in Quebec had long been the main Canadian company producing N95's, but after China, France, Taiwan and the United States barred them from repatriating the masks produced by Medicom in their factories, the Government of Canada awarded them a 10 year contract to build a factory to produce masks in Montreal.

The mask industry

Manufacturing

This section needs expansion. You can help by adding to it. (May 2020)

As of 2019, mainland China manufactured half the world output of masks. As Covid-19 spread, enterprises in several countries quickly started or increased the production of face masks. Cottage industries and volunteer groups also emerged, manufacturing cloth masks for localised use. They used various patterns, including some with a bend-to-fit nosepiece inserts. Individual hospitals developed and requested a library of specific patterns.

Distribution

This section needs expansion. You can help by adding to it. (May 2020)

Some clinical stockpiles have proved inadequate in scale, and markets have expanded as non-medical consumers started obeying mandated mask-wearing or determined that masks might help or encourage them. Worldwide demand for face masks has resulted in masks shipping around the globe as a result of commercial transactions or of donations.

Culture

Attitudes

In East Asian societies, a primary reason for mask-wearing is to protect others from oneself. It is seen as a collective responsibility to reduce the transmission of the virus. The broad assumption behind the act is that anyone, including seemingly healthy people, can be a carrier of the coronavirus. A face mask is thus seen as a symbol of solidarity. Elsewhere, the need for mask-wearing is often seen in an individual's perspective where masks only serve to protect oneself.

Cultural norms and social pressure may also impede mask-wearing in public. According to the Hong Kong doctor and infectious disease expert Joseph Tsang, the promotion of universal masking may resolve perceptions against mask-wearing, because mask-wearing is intimidating if few people wear masks due to cultural barriers, but if all people wear masks it shows a message that people are in this together.

In the western world, the public usage of masks still often carries a large stigma, as it is seen as a sign of sickness. This stigmatization is a large obstacle to overcome, because people may feel too ashamed to wear a mask in public and therefore opt to not wear one. Secondly, it is heavily racialized as an Asian phenomenon. This has been reinforced in a lot of media discourses, where unrelated stories about the pandemic are often accompanied by imagery of Asian people in masks. The focus on race has brought hostility towards Asians who are confronted with the choice to mask as precaution while they face discrimination for it. However, there is also a divide within the western world, as seen in the Czech Republic and Slovakia where mass mobilization has occurred to reinforce the solidarity in mask-wearing since March 2020.

On social media, there has been an effort with the #masks4all campaign to encourage people to use masks. Mask-wearing has been called a prosocial behavior in which one protects others within their community.

In the US, mask-wearing was politicized and is seen as a political statement by some people. Democrats were more likely than Republicans to say that they are wearing a mask when leaving home, 76% to 59% according to one poll.

Fashion

Face masks have had an impact on fashion, with the masks themselves becoming a fashion statements, haute couture brands having pivoted to address both public health and aesthetic needs.

Mask use and policies by country and territory

% of population wearing face masks in public, by country/territory (as of May 5)

Country/territory	%
Hong Kong	90
Singapore	90
China	88
Italy	87
Taiwan	87
Thailand	87
Japan	86
Vietnam	86
Malaysia	85
Indonesia	84
Philippines	84
India	82
United Arab Emirates	78
Spain	72
Mexico	67
United States	63
Germany	62
France	56
Saudi Arabia	56
Canada	41
Australia	25
United Kingdom	13
Finland	7
Norway	7
Denmark	5
Sweden	2

• Argentina: After appearance of three asymptomatic cases, the capital Buenos Aires introduced compulsory masking since 14 April. Wearing a mask was made obligatory for everyone on public transit and everyone who contacts with the public in their position. Violators can face a fine. Authorities also prohibited the sale of N95 face masks to non-medical workers, suggesting the general public to use home-made masks instead.
• Austria: Everyone entering a supermarket, a grocery store, or a drug store or using public transportation must wear a face mask, mandatory since 14 April.
• Bahamas: On 19 April, the prime minister announced that wearing a mask or covering one's face with clothing is mandatory in public. Employers must provide their employees who are serving the general public with masks.
• Bahrain: The Kingdom made wearing face masks in public areas compulsory for citizens and residents as well as shop workers.
• Benin: From 8 April, Benin's authorities began enforcing the mandatory wearing of face masks to halt the coronavirus.
• Bosnia and Herzegovina: Wearing a face mask is compulsory.
• Bulgaria: Bulgaria's government passed an order imposing an obligation to wear face masks on 30 March. The order was cancelled the next day and changed into a recommendation, due to legal complaints.
• Cambodia: Many Cambodians started wearing face masks soon after the outbreak began in Wuhan. Businesses started to require customers to wear masks.
• Cameroon: On 6 April, mayor of Douala announced that wearing a mask will be mandatory to slow the spread of coronavirus.
• Canada: Since 6 April, health officials recommend wearing non-medical masks in situations where physical distancing from others is difficult (like buying groceries, or public transit).
• Chile: From 8 April, Chilean Health Minister announced wearing a mask is mandatory in public transit.
• China: Healthy individuals are advised to wear disposable medical masks in public places. Some local governments require wearing masks when going outside. Shanghai makes wearing masks mandatory in public places.
• Colombia: In response to recommendations from the WHO, Colombia changed its policy on the use of masks and made it mandatory throughout the country for the use of public transport during the coronavirus emergency.
• Cuba: On 11 March, the government urged citizens to make their own masks, while the textile industry was drafted to fabricate them. People were advised to carry several cloth masks with them, depending on how many hours they plan to spend in public areas. Later, wearing a mask was made mandatory.
• Czech Republic: Forbidden to go out in public without wearing a mask, or covering one's nose and mouth.
• Dominican Republic: Since 16 April, the use of face mask is mandatory in all public spaces and in the workplace.
• DR Congo: Since 20 April, wearing masks in the capital of Kinshasa is mandatory.
• Ecuador: On 8 April, the Emergency Operations Committee (COE) decided to make face masks obligatory in public spaces.
• Ethiopia: The Council of Ministers approved a regulation that outlaws handshakes, and obligates the use of face masks in public places.
• France: On 3 March, the government issued a degree announcing requisition of stocks of FFP2 and anti-splash masks until 31 May 2020. On 8 May 2020, the government announced that 200 million masks per week will be available starting on 11 May: 100 million for medical workers and 100 million for the general public.
• Gabon: On 10 April, the Gabonese government announced individuals in all parts of the country are required to wear masks in public to limit the spread of COVID-19.
• Germany: On 31 March, city-county Jena, Thuringia, was the first large German city to introduce an obligation to wear masks, or makeshift masks including scarves, in supermarkets, public transport, and buildings with public traffic, from 6 April, very successfully. On 2 April, the Robert Koch Institute, the federal epidemic authority, changed its previous recommendation that only people with symptoms should wear masks to also include people without symptoms. County Nordhausen, Thuringia, followed the example of Jena, since 13 April, several other cities later. German chancellor Merkel and state governors first gave "strong advice" to wear face masks in public from 20 April, Saxony made it mandatory from that day, Saxony-Anhalt followed from 23 April and (the rest of) Thurinigia from 24 April, finally the governors agreed to make it mandatory, so most other states followed from 27 April, except Schleswig-Holstein, from 29 April, and Berlin, where shops were excluded first, they were included from 29 April.
• Guinea: Guinean President Alpha Conde decided to make wearing masks compulsory.
• Honduras: From 7 April, Honduras President announced all citizens will now be required to cover their mouths when they are outside.
• Hong Kong: Members of the public are recommended to wear a surgical mask when taking public transport or staying in crowded places.
• India: From 9 April, masking is compulsory in the state of Odisha. When leaving their home, people must cover their mouth and nose with masks or multilayered cloth (like handkerchief, dupatta, towel, etc.).
• Indonesia: Citizens were ordered to wear face masks when they leave the house.
• Ireland: Starting monday 18 May, the use of cloth face covering is recommend in enclosed public spaces where it's difficult to maintain social distance.
• Israel: All residents are asked to wear face masks when in public.
• Italy: Regions of Lombardy and Tuscany made wearing a face mask compulsory before going out in early April.
• Ivory Coast: From April, 26 masks have become compulsory to enter shopping malls or supermarkets in the Southern suburb of Abidjan, Marcory.
• Japan: Masks have been widely used by healthy individuals despite absence of official advice to do so. On 1 March, prime minister Shinzo Abe enacted a policy in Hokkaido instructing manufacturers to sell face masks directly to the government, which would then deliver them to residents.
• Kenya: Wearing a face mask is compulsory since 4 April. The government has Kenyans to strictly observe social distancing, which has been proved to one of the most efficient ways of preventing infection risks.
• Liberia: From 21 April, it is now compulsory to wear a face mask or covering in public.
• Lithuania: Wearing a face mask or any other means of covering one's nose and mouth in public places is compulsory since 10 April 2020.
• Luxembourg: From 20 April, wearing a mask is mandatory in places where it is not possible to keep enough distance to others such as supermarkets or on public transport.
• Malaysia: Masks have been widely used by healthy individuals despite absence of official advice to do so. On 17 March, Malaysia banned exports of medical and surgical masks, to meet local demand. In April, the government was set to distribute 24.62 million masks, four for each household, while advising people to only use them if they have symptoms.
• Mexico: From 17 April, all Mexico City Metro passengers must wear masks while inside stations and on trains, Mayor Claudia Sheinbaum announced on 15 April.
• Mongolia: Wearing a mask is now mandatory while riding public transportation in Ulaanbaatar. Public officials and news broadcasters had even adopted to wearing masks through press conferences and news broadcasts.
• Morocco: Wearing a face mask is compulsory.
• Mozambique: The Mozambican government announced on 8 April that wearing face masks is now compulsory on all forms of passenger transport, and wherever groups of people are gathered.
• North Macedonia: As of 22 April, citizens of Kumanovo, Tetovo, and Prilep must wear protective masks and gloves outside their homes, at public places, outdoor and indoor areas, markets, and shops announced the government.
• Pakistan: The Balochistan government on 18 April told citizens to wear face masks when going outside. According to provincial government spokesperson Liaquat Shahwani, citizens have been urged to wear masks or to cover their faces with any cloth in the wake of the COVID-19 outbreak.
• Panama: Panama has made it obligatory to wear a face mask whenever going outside, while also recommending the manufacture of a homemade cloth face mask to those who cannot purchase face masks.
• Peru: From 7 April, the Peruvian government started distributing free masks after decreeing their mandatory use in the streets to chase away the new coronavirus, said President Martin Vizcarra.
• Philippines: From 2 April, the government required all those living in areas under enhanced community quarantine to wear face masks.
• Poland: Since 16 April, covering lips and nose is compulsory before leaving one's house (e.g., by a disposable mask, cloth mask, or scarf).
• Russia: Khabarovsk has made the wearing of face masks obligatory to fight the spike in respiratory diseases and prevent the spread of the coronavirus.
• Rwanda: On 20 April, Cabinet Minister of Health Daniel Ngamije said the latest guidelines require everyone to wear a mask in public, and at home during the lockdown and thereafter.
• Scotland: On 28 April, the First Minister for Scotland Nicola Sturgeon advised the voluntary use of cloth face masks in enclosed spaces such as shops and public transport (but not generally in public), while noting their limitation.
• Singapore: Masks have been widely used by healthy individuals despite initial absence of official advice to do so. General mask-wearing was no longer discouraged from 3 April, and made mandatory outside of one's residence from 14 April.
• Spain: Wearing masks has been required since 4 May while on public transportation, which includes taxis, trains and buses. The government is providing masks to the majority of people riding public transportation, regardless of if they have a mask on.
• Slovakia: Forbidden to go out in public without wearing a mask or covering one's nose and mouth.
• Slovenia: From 29 March, wearing a face mask, even one made at home, or equivalents such as scarves that cover the mouth and nose is mandatory along with protective gloves; the decree stipulates that masks and gloves need to be worn in indoor public spaces.
• South Africa: On 10 April, Minister of Health recommended that the general public use cloth face masks when going out in public (in addition to hand-washing and social distancing). After 1 May, covering one's nose and mouth will be mandatory in public (with a cloth mask, scarf, T-shirt, etc.).
• South Korea: Masks have been widely used by healthy individuals despite absence of official advice to do so. The government implemented a policy of centralized procurement and rationing of face masks, purchasing 80 percent of national production since early March. On 25 May, the Korean government / Central Disaster and Safety Countermeasure Headquarters required passengers on buses, taxis, subways, and flights to wear masks.
• Sweden: Sweden's Public Health Agency doubts the effectiveness of face masks, and the agency does not recommend public use of face masks. The government has also warned that wearing them might create a false sense of security.
• Taiwan: On 21 January, the government announced a temporary ban on the export of face masks. On 6 February, the government instituted a mask rationing system. Taiwan has been producing ten million masks per day since mid-March. On 1 April, passengers on trains and intercity buses were required to wear face masks, unmasked riders facing a fine.
• Turkey: Residents will be required to wear masks at markets, as Turkish president announced.
• Ukraine: Since 6 April, wearing a face mask is required by the government in public places. In Kyiv, public places were clarified to include parks and streets.
• United States: On 6 April, the CDC recommended the wearing of non-medical cloth face coverings when in public places. Since 17 April, residents of New York, must wear masks in public; New Jersey and Maryland issued similar requirements for their residents.
• Uzbekistan: Officials made protective masks mandatory in all major cities in order to prevent the spread of coronavirus. Officials on 22 March said citizens not wearing masks in public in major cities would be fined $22 for the first offense and $67 for repeat offenses.
• Venezuela: The government ordered the country’s citizens to wear face masks in public in response to the arrival of the novel coronavirus.
• Vietnam: Since 16 March, everyone must wear a face mask when going to public places (such as grocery stores, transportation hubs, and public transport).
• Zambia: The government made it mandatory to wear face masks to minimise the spread in the country.

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• Responses to the COVID-19 pandemic
• National responses to the COVID-19 pandemic
• Medical masks