Along with other protective measures, such as social or physical distancing and proper hand hygiene, face masks may be an easy, inexpensive, and potentially effective way to stay safe and flatten the COVID-19 curve.
Health agencies, including the Centers for Disease Control and Prevention (CDC), now encourage all people to wear masksTrusted Source or face coverings when out in public.
So, which type of face mask works best for avoiding transmission of the new coronavirus when you’re out in public? Continue reading to learn more about the different types of masks and which one you should wear.
With the new coronavirus, known as SARS-CoV-2, the largest amount of viral shedding, or transmission, happens early in the course of the disease. Therefore, people may be contagious before they even start to show symptoms.
Moreover, scientific models suggest that up to 80 percent of transmission stems from asymptomatic carriers of the virus.
Emerging research suggests that widespread mask use may help limit the transmission of the virus by people who don’t realize that they may have it.
What types of face masks work best?
Fit- and seal-tested respirators are made of tangled fibers that are highly effective at filtering pathogens in the air. These respirators must meet the rigorous filtration standards set by the National Institute for Occupational Safety and Health (NIOSH).
The diameter of the coronavirus is estimated to be 125 nanometers (nm). Keeping this in mind, it’s helpful to know that:
Some of these respirators have valves that allow exhaled air to get out, making it easier for the user to breathe. However, the downside of this is that other people are susceptible to the particles and pathogens that are exhaled through these valves.
Frontline healthcare and other workers who need to use these masks as part of their job are tested at least once a year to verify proper respirator size and fit. This also includes checking for air leakage using specific test particles. These routine tests help ensure that harmful particles and pathogens can’t leak through.
There are various types of surgical masks. Typically, these disposable, single-use masks are cut into a rectangle shape with pleats that expand to cover your nose, mouth, and jawline. They are composed of breathable synthetic fabric.
Unlike respirators, surgical face masks don’t have to meet NIOSH filtration standards. They aren’t required to form an airtight seal against the area of your face that they cover.
How well surgical masks filter pathogens varies widely, with reports ranging from 10 to 90 percent.
Despite differences in fit and filtration capacity, a randomized trial found that surgical face masks and N95 respirators reduced participant risk of various respiratory illnesses in similar ways.
Adherence — or proper and consistent use — played a more pivotal role than the type of medical-grade mask or respirator worn by study participants. Other studies have since supported these findings.
Do-it-yourself (DIY) cloth masks are less effective at protecting the wearer because most have gaps near the nose, cheeks, and jaw where tiny droplets can be inhaled. Also, the fabric is often porous and can’t keep out tiny droplets.
Although cloth masks tend to be less effective than their medical-grade counterparts, experimental results suggest they are far better than no mask at all when worn and constructed properly.
The CDC suggests using two layers of tightly woven 100 percent cotton fabric — such as quilter’s material or bedsheets with a high thread count — folded in multiple layers.
Thicker, high-grade cotton masks are usually better at filtering small particles. However, stay away from materials that are too thick, such as vacuum cleaner bags.
In general, a bit of breathing resistance is expected when wearing a mask. Materials that don’t let any air through can make it hard to breathe. This can place pressure on your heart and lungs.
Built-in filters can boost the effectiveness of DIY face masks. Coffee filters, paper towels, and just about any other filter can help boost protection.
The CDC recommends wearing cloth face masks in public settings where compliance with physical distancing measures may be difficult to achieve and maintain. This is key in areas where community-based transmission is high.
This includes, but is not limited to, settings such as:
Does everyone need to wear a mask?
Surgical masks and respirators are in high demand and supplies are limited. Therefore, they should be reserved for frontline healthcare workers and first responders.
However, the CDC recommends that just about everyone wear a cloth face mask.
People who can’t remove the mask on their own or have breathing issues shouldn’t wear masks. Neither should children under the age of 2 due to the risk of suffocation.
If you aren’t sure if a face mask is safe for you to wear, be sure to talk to your doctor. They can advise you on what type of face covering may be best for you if you need to be out in public.
In addition to physical distancing and using proper hand hygiene, many health experts consider the use of face masks to be a key measure in helping to prevent the spread of COVID-19.
Although homemade cloth masks aren’t as effective at filtering out small particles as respirators or surgical masks, they offer more protection than not wearing any face mask at all.
The effectiveness of homemade face masks can be enhanced with proper construction, wear, and maintenance.
As people return to work, continued use of appropriate face masks might help mitigate an increase in virus transmission.