Sofia Martinez
Plastic barriers have become a common sight since the start of the COVID-19 pandemic, with many businesses and schools installing them to prevent the spread of the virus. While it may seem intuitive that plastic shields would provide protection against airborne viruses, some scientists and researchers argue that they are ineffective and may even increase the risk of transmission by impeding airflow and ventilation. This belief is supported by a study from John Hopkins University, which found that desk screens in classrooms were associated with a higher risk of coronavirus infection. However, not everyone agrees, and some argue that plastic barriers can be beneficial when combined with other measures such as face masks and proper ventilation. With the available evidence, it is clear that the effectiveness of plastic barriers in preventing COVID-19 transmission is a highly debated topic.
| Characteristics | Values |
|---|---|
| Plastic barriers impede airflow and ventilation | Yes |
| Plastic barriers give a false sense of security | Yes |
| Plastic barriers are effective in preventing the spread of COVID-19 | No |
| Plastic barriers are useful in preventing the spread of COVID-19 when used with other measures | Maybe |
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What You'll Learn
Plastic barriers may give people a false sense of security
Since the start of the pandemic, plastic barriers have been erected to prevent the spread of COVID-19. While this may seem like an intuitive solution, scientists have found that these barriers may not be effective and could even be causing more harm than good.
The New York Times has reported that plastic barriers may give people a false sense of security. While they can block larger particles, such as those from a cough, they are ineffective at trapping smaller aerosols, which simply float around or travel over the screen. These smaller particles are a primary mechanism for the spread of COVID-19 and can accumulate in the air within a short time, posing a risk to anyone in the room.
A study by Catherine Noakes, a professor of environmental engineering for buildings at the University of Leeds, found that plastic barriers in hospitals funnelled air towards other people, potentially exposing them to germs. Noakes also noted that large numbers of screens in places like classrooms can impede airflow and create pockets of higher and lower risk that are challenging to identify.
Additionally, a study by researchers from Johns Hopkins found that desk screens in classrooms were associated with an increased risk of coronavirus infection due to impeded airflow. Similarly, a study of schools in Georgia found that desk barriers had little effect on the spread of the virus compared to ventilation improvements and masking.
Instead of relying on plastic barriers, experts recommend improving ventilation and adding air filtration systems to circulate fresh air and reduce the concentration of aerosol particles.
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They can impede normal airflow and ventilation
Plastic barriers have become commonplace during the pandemic, but their effectiveness in preventing the spread of COVID-19 is questionable. In fact, scientists who study aerosols, airflow, and ventilation say that these barriers often do not help and may even be detrimental.
One of the main issues with plastic barriers is their potential to impede normal airflow and ventilation. In classrooms, offices, and stores, exhaled breath particles usually disperse, carried by air currents, and are replaced by fresh air roughly every 15 to 30 minutes, depending on the ventilation system. However, rows of plastic shields can obstruct this normal airflow, causing exhaled particles to linger and accumulate in the room.
A study at Wellesley High School in Boston, which had clear plastic barriers installed around workstations, serves as a case in point. School and health officials conducted an investigation by puffing smoke into the workstations to analyze airflow. They found that the smoke did not ascend into the ceiling filters as expected but instead swirled around the workstations, demonstrating that the plexiglass barriers were impeding airflow and increasing the risk of COVID-19 transmission.
Another study looking at schools in Massachusetts found similar results, concluding that plexiglass dividers with side walls were obstructing airflow. This is supported by the observations of aerosol experts, who agree that desk shields are unlikely to help and are more likely to interfere with the normal ventilation of the room. As Richard Corsi, incoming dean of engineering at the University of California, Davis, explains, "If there are aerosol particles in the classroom air, those shields around students won't protect them. Depending on the airflow conditions in the room, you can get a downdraft into those little spaces that you're now confined in and cause particles to concentrate."
Therefore, while plastic barriers may give a false sense of security, they can impede normal airflow and ventilation, potentially increasing the risk of COVID-19 transmission.
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They may redirect germs to another worker or customer
Since the start of the pandemic, plastic barriers have been erected to prevent the spread of COVID-19. These barriers are meant to act as physical obstacles for airborne viruses, allowing people to see each other while being protected. However, some scientists and researchers question their effectiveness and argue that they may even be harmful.
One concern is that these plastic barriers may redirect germs to another worker or customer. Research suggests that a barrier protecting a clerk behind a checkout counter, for example, can redirect the flow of exhaled particles, potentially spreading the virus to others nearby. This can be particularly true in spaces like nail salons or classrooms, where rows of plastic shields are commonly used.
The placement of these plastic barriers can alter airflow in a room, disrupting normal ventilation. This disruption can create "dead zones," where viral aerosol particles can accumulate and become highly concentrated. Under typical conditions without plastic barriers, inhaled particulates are dispersed by air currents and replaced with fresh air approximately every 15 to 30 minutes due to normal ventilation systems.
While the presence of physical barriers may intuitively seem protective, scientists who study aerosols, airflow, and ventilation assert that these barriers are often ineffective and may give people a false sense of security. In some cases, the barriers could even exacerbate the problem by redirecting the flow of germs and obstructing normal airflow patterns. Therefore, it is essential to consider the potential impact of plastic barriers on the redirection of germs and the overall airflow dynamics within a space.
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They do not stop smaller airborne particles
Plastic barriers have become a common sight during the COVID-19 pandemic, with many businesses and schools installing them to prevent the spread of the virus. However, there is growing evidence to suggest that these barriers may not be effective in stopping smaller airborne particles and could even be doing more harm than good.
Aerosol experts have stated that plastic barriers do little to stop the spread of COVID-19 through airborne transmission. Smaller airborne particles, which are a major route of COVID-19 infection, can still pass through the barriers and spread the virus. This means that people sitting or standing near the barriers are still breathing the same shared air, which can increase the risk of infection.
In addition, plastic barriers can impede normal airflow and ventilation. A study at John Hopkins found that desk screens in classrooms were associated with an increased risk of coronavirus infection due to blocked airflow. Another investigation at Wellesley High School in Boston, which had clear plastic barriers installed around workstations, found that the air just lingered and swirled around instead of ascending into the ceiling filters. This blocked airflow can cause viral particles to accumulate in a room, increasing the risk of COVID-19 transmission.
While plastic barriers may give people a false sense of security, they do not effectively prevent the spread of smaller airborne particles. Therefore, it is important to focus on other mitigation measures, such as improving ventilation, adding air filtration systems, encouraging vaccination, wearing masks, and maintaining social distancing.
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They are not the only option to prevent COVID spread
While plastic barriers have been used extensively during the COVID-19 pandemic to separate people and groups, they may not be the most effective way to prevent the spread of the virus. In fact, some studies suggest that these barriers may even be detrimental to our efforts to stop the spread.
So, what else can we do to prevent the spread of COVID-19? Well, one of the key mechanisms of COVID-19 spread is through aerosols, or small droplets that are exhaled when we speak or breathe. These aerosols can accumulate in indoor spaces with poor ventilation, increasing the risk of transmission. Therefore, improving ventilation and adding air filtration systems is crucial. This can be achieved by circulating air as much as possible, bringing in fresh air from outside, and using exhaust fans to push air out. Additionally, UV lamps placed near vents can help to clean the air.
Another important strategy is to encourage vaccination and mask-wearing. Masks provide a physical barrier that can help block the release of respiratory droplets into the air and can also protect the wearer from inhaling these droplets. Encouraging social distancing is also key, as maintaining physical distance reduces the likelihood of inhaling these aerosols.
Furthermore, it is important to practice good hygiene by regularly washing or sanitizing hands and cleaning down surfaces. This is because COVID-19 can also spread through direct contact with contaminated surfaces, followed by touching the eyes, nose, or mouth.
In certain settings, such as hospitals, plastic products like baby bassinets and aerosol boxes made from transparent polycarbonate sheets can be useful. These products have clean lines, preventing bacteria from living in crevices, and can be easily cleaned and disinfected. However, the use of plastic barriers in indoor public spaces like classrooms and offices may not be the most effective strategy and could even impede normal airflow, highlighting the importance of exploring alternative measures.
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Frequently asked questions
No, there is no research to support the claim that plastic barriers help prevent COVID-19. In fact, they might impede ventilation and increase the risk of COVID-19 transmission.
Plastic barriers can block the normal airflow in a room, causing viral particles to accumulate.
Plastic barriers can provide a physical and psychological barrier that may de-escalate an angry customer's demeanor. They can also limit hand-transmitted germs and bacteria when exchanging objects.
Improving ventilation and air filtration is key to reducing airborne transmission. Air filters, exhaust fans, and open windows can help improve air circulation.
