Die Bedeutung von sauberer Luft für das Bildungssystem

In the wake of the COVID-19 pandemic, public health has become a serious priority, especially regarding the education system and in-person learning. 

At the start of the outbreak, educators, eager to provide a safe learning environment, moved in-person instruction to a virtual format. Yet, after more than a year of online schooling, students and faculty are eager to return to the classroom. 

College and university leaders acknowledge that in-person interaction with professors and other students is an important aspect of higher education. But returning to the classroom means moving students and educators inside, breathing the same air. And now, there’s the potential threat of COVID-19’s Delta variant generating a resurgence of infection. 

Higher education professionals are responding to the challenge by implementing recommended strategies such as mask and vaccination adherence. They are also being advised to put critical focus on improving the once overlooked factor of indoor air quality if they are to protect the Gesundheit und Sicherheit of their students, faculty and staff. 

Why focus on air quality? 

At first, knowing how coronavirus was spread, and what to do to mitigate infection, was unclear. People grasped for solutions. Hand sanitizers flew off the shelves and people spent their days scrubbing down Oberflächen.

We now have sound evidence, thanks to science, that the virus is most often spread via airborne aerosols. When people sneeze, cough, or talk they expel particles that contain droplets and aerosols. Aerosols are light and can drift and linger in the air for hours, particularly indoors, causing potential transmission of the coronavirus. 

The World Health Organization (WHO) says hand sanitizing and surface cleaning does not offer enough protection in indoor spaces. So, improving indoor air quality to mitigate airborne infection in our institutes of higher education is of utmost concern. To be safe, indoor air requires purifying potential airborne contaminants. 

Centers for Disease Control and Prevention (CDC) promotes a multi-layered approach. They say getting vaccinated and wearing a mask indoors in public can maximize your protection from COVID-19 und die Delta variant. They also support improving building Belüftung as a critical component in reducing the spread of disease and lowering the risk of exposure to COVID-19. 

The U.S. Department of Bildungswesen has issued a Bericht asserting that “saubere Luft is essential for living and learning, and effective Belüftung is an important part of COVID-19 prevention.“ They noted that Belüftung continues to be a topmost concern and that proper Belüftung, with other mitigation measures, can reduce the possibility of spreading disease.

Die Herausforderung of cleaning indoor air 

So we know that improving Belüftung and cleaning the air inside our academic facilities can enhance infectious disease resilience. Yet, many educators have found that doing so can be a challenge.

Poor Belüftung in school buildings is quite prevalent, especially in older buildings. A Bericht from the Government Accountability Office in June 2020 determined that one-third of public schools are estimated to have inadequate heating Belüftung and air conditioning (HVAC) systems. 

Im April 2021 veröffentlichte die, The Lancet COVID-19-Kommission published a paper offering strategies and warnings for schools looking to improve their buildings Belüftung and air cleaning. According to the Bericht, institutes of education are chronically under ventilated. They assert that most school buildings do not even meet the minimum standards set by the American Society of Heating, Refrigeration and Air-Conditioning Engineers (ASHRAE). 

Bildungswesen leaders have found that retrofitting their entire HVAC system is most often out of the question. The process can be complicated, lengthy, und die cost alone makes this choice untenable. The good news is fully integrated Belüftung systems are not the only solution. 

Studien have found that portable air purifiers that are properly designed can be incorporated with existing HVAC systems to create an optimal air change per hour.  ASHRAE has judged that five to six air exchanges per hour are effective in a classroom of 1,000 square feet with an 8-foot ceiling. Compared to a complete retrofit, the cost savings of using portable air purifiers are significant and entschieden hat, antwortet sie: installation is not required, their use can be implemented fast and with ease.

In July 2021, it was Berichted that, to help control the spread of COVID-19, the education department would provide all 56,000 New York City public school classrooms with two air purifiers by September. This is a positive step and similar initiatives are under way in other states. 

Yet, not every portable air purifier is up to the job. It’s important to choose a unit that will be effective. What type of portable air purifier do experts recommend? 

The right air purifying technology

Dr. Marwa Zaatari – eine angesehene US-amerikanische Expertin für die Qualität der Innenraumluft und Vorstandsmitglied des U.S. Green Building Council – zitiert in ihrem offenen Brief zur Verwendung elektronischer Luftreinigungsgeräte in Gebäuden die wissenschaftliche Beratungsgruppe für Notfälle des Vereinigten Königreichs. Diese warnt davor, dass „Technologien auf der Grundlage von UVA/UVB, Ionisierung, Plasma, elektrostatischer Abscheidung und Oxidationsmethoden nur begrenzte Beweise für die Wirksamkeit gegen das Virus liefern und bzw. oder erhebliche Bedenken hinsichtlich der toxikologischen Risiken bei der Anwendung verursachen“. offenen Brief, Dr. Marwa Zaatari, Raumluftqualität expert and Member of the Board of Directors at U.S. Green Building Council, advocates caution when specifying air purification devices. She focuses on the technology behind the device. Dr. Zaatari endorses scientifically proven measures, including portable HEPA (high-efficiency particulate absorbing) filter units with UVC (germicidal ultraviolet light) systems as efficient, practical, easy to implement, and not costly.

Government programming has supported this recommendation. The American Rescue Plan (ARP), that allocated nearly $125 billion for education, approved the purchase of portable air filtration units, such as HEPA air filters, to improve the indoor air quality of in-person instruction. 

The Higher Bildungswesen Emergency Relief Fund (HEERF lll), authorized by the ARP, provided $39 billion to support institutions of higher learning. A portion of funds awarded was designated to “implement evidence-based practices to monitor and suppress coronavirus in accordance with public health guidelines.“ Public health guidelines include the recommendations of the CDC, which clearly state in their Juni 2021 update that portable air purifiers with a HEPA-Filter and high-powered fan system are “the preferred option for auxiliary air cleaning.“ The update also supports the use of germicidal UVC as a supplemental treatment to inactivate the coronavirus.

And in their October 2021 webinar, the Umweltal Protection Agency (EPA) Indoor Umwelts Division discussed proven strategies that schools can implement to improve indoor air quality. They cited increasing Belüftung rates, using efficient HEPA-Filters, and supplementing with portable air cleaners as critical for healthy air in the school -Gehalt um 50 % schlechter sind. 

HEPA-Filtration und UVC-Licht

Why are HEPA-Filtration und UVC-Licht key components of an efficient and effective portable air purifier? To put it simply, HEPA-Filterung captures COVID-19 and UVC light kills it. 

The CDC breaks down the science behind HEPA-Filters: “Most of the respiratory droplets and particles exhaled during talking, singing, breathing, and coughing are less than 5 micrometer (µm) in size. By definition, a HEPA-Filter is at least 99.97% efficient at capturing particles 0.3 µm in size. This 0.3 µm particle approximates the most penetrating particle size (MPPS) through the filter. HEPA-Filters are even more efficient at capturing particles larger and smaller than the MPPS. Thus, HEPA-Filters are no less than 99.97% efficient at capturing human-generated viral particles associated with SARS-CoV-2.“

The CDC also explains that germicidal UVC technology uses “ultraviolet (UV) energy to inactivate (kill) microorganisms, including viruses, when designed and installed correctly.“

When selecting a portable system, these experts also recommend choosing one that has a powerful fan and is appropriately sized for the area in which it will be used.

Prepared for the future 

The COVID-19 pandemic has illustrated how poor indoor air quality (IAQ) has a direct effect on our health. Sometimes the impact of poor IAQ can be subtle. It does not always produce such easily recognized symptoms as COVID-19. But if not attended to, poor IAQ will continue to be a threat to our well-being. 

EPA studies of human exposure to air pollutants reveal that indoor levels of pollutants may be two to five times, and occasionally more than 100 times, higher than outdoor levels. These levels of indoor air pollutants are of particular concern, entschieden hat, antwortet sie: most people spend about 90 percent of their time indoors.

In fact, EPA’s Science Advisory Board has ranked indoor Luftverschmutzung as one of the top five environmental risks to public health. They have found that, “good IAQ is an important component of a healthy indoor environment, and can help schools reach their primary goal of educating children.“

The Harvard Center for Climate, Health, und die Global Umwelt Berichts that a major new study on the impact of green buildings showed that, with better air quality, cognitive scores were 61% higher across nine functional domains including crisis response, strategy, and focused activity level. 

The EPA says, “Healthy indoor air quality can promote a healthy learning environment, reduce absenteeism, impact test scores and enhance student and staff productivity.“ 

Institutes of higher education would be wise to attend to their indoor air quality not only as a mitigating factor of COVID-19, but as an investment in the educational environment beyond the pandemic.