Опубликована: Янв. 1, 2024
Язык: Английский
Environmental Science & Technology, Год журнала: 2023, Номер 57(42), С. 15990 - 15998
Опубликована: Окт. 12, 2023
One strategy for mitigating the indoor transmission of airborne pathogens, including SARS-CoV-2 virus, is irradiation by germicidal UV light (GUV). A particularly promising approach 222 nm from KrCl excimer lamps (GUV
Язык: Английский
Процитировано
30
Building and Environment, Год журнала: 2023, Номер 245, С. 110900 - 110900
Опубликована: Окт. 7, 2023
Язык: Английский
Процитировано
18
ACS ES&T Air, Год журнала: 2024, Номер 1(7), С. 725 - 733
Опубликована: Май 4, 2024
Since the 1930s, germicidal ultraviolet (GUV) irradiation has been used indoors to prevent transmission of airborne diseases, such as tuberculosis and measles. Recently, it received renewed attention due COVID-19 pandemic. While GUV radiation shown be effective in inactivating bacteria viruses, few studies on impact indoor air quality have published. In this work, we evaluate effects GUV222 (GUV at 222 nm) chemistry a common volatile organic compound (VOC), limonene. We found that production O3 by lamps caused formation particulate matter (PM) oxygenated compounds (VOCs). also proceeds through ozonolysis limonene well reaction with secondary OH, presence light led observable but small perturbations chemistry. Understanding is important evaluating safety these devices.
Язык: Английский
Процитировано
7
Materials Today Communications, Год журнала: 2025, Номер unknown, С. 112132 - 112132
Опубликована: Март 1, 2025
Язык: Английский
Процитировано
1
Building and Environment, Год журнала: 2025, Номер unknown, С. 112868 - 112868
Опубликована: Март 1, 2025
Язык: Английский
Процитировано
1
Environmental Science Processes & Impacts, Год журнала: 2024, Номер 26(6), С. 1090 - 1106
Опубликована: Янв. 1, 2024
Devices using 222 nm germicidal ultraviolet light (GUV222) have been marketed to reduce virus transmission indoors. However, GUV222 generates ozone which can react with gases and surfaces create undesirable air byproducts.
Язык: Английский
Процитировано
6
Health Security, Год журнала: 2024, Номер 22(2), С. 108 - 129
Опубликована: Апрель 1, 2024
In 2022, the Pentagon Force Protection Agency found threat agnostic detection of novel bioaerosol threats to be "not feasible for daily operations" due cost reagents used metagenomics, sequencing instruments, and labor subject matter experts analyze bioinformatics. Similar operational difficulties might extend many 280,000 buildings (totaling 2.3 billion square feet) at 5,000 secure US Department Defense military sites, 250 Navy ships, as well civilian buildings. These economic barriers can still addressed in a manner by dynamically pooling samples from dry filter units, called spike-triggered virtualization, whereby depth are automatically modulated based on biothreats output. By running high average factor, annual per unit reduced 10 100 times depending chosen trigger thresholds. Artificial intelligence further enhance sensitivity virtualization. The risk infection during 12- 24-hour window between incident its remains, but some cases it 80% or more with high-speed indoor air cleaning exceeding 12 changes hour, which is similar rate passenger airplanes flight. That level hour higher likely cost-prohibitive using central heating ventilation conditioning systems, achieved economically portable filtration rooms typical ceiling heights (less than approximately $0.50 $1 foot do-it-yourself units $2 $5 high-efficiency particulate filters.
Язык: Английский
Процитировано
4
Environmental Science & Technology, Год журнала: 2024, Номер 58(18), С. 7916 - 7923
Опубликована: Апрель 29, 2024
In response to the COVID-19 pandemic, air cleaning technologies were promoted as useful tools for disinfecting public spaces and combating airborne pathogen transmission. However, no standard method exists assess potentially harmful byproduct formation from cleaners. Through a consensus development process, draft test portable cleaner performance was developed, suite of cleaners employing seven different tested. The quantifies not only removal efficiency challenge chemical ultrafine particulate matter but also formation. Clean delivery rates (CADRs) are used quantify particle efficiencies, an emission rate framework is formaldehyde, ozone, other volatile organic compounds. We find that tested photocatalytic oxidation germicidal ultraviolet light (GUV) produced highest levels aldehyde byproducts having 202 243 μg h
Язык: Английский
Процитировано
4
Environmental Science & Technology, Год журнала: 2024, Номер 58(27), С. 12051 - 12061
Опубликована: Июнь 26, 2024
Germicidal ultraviolet light (GUV) systems are designed to control airborne pathogen transmission in buildings. However, it is important acknowledge that certain conditions and system configurations may lead GUV produce air contaminants including oxidants secondary organic aerosols (SOA). In this study, we modeled the formation dispersion of generated by operation employing C 254 222 nm. Using a three-dimensional computational fluid dynamics model, examined breathing zone concentrations chemical species an occupied classroom. Our findings indicate operating leads approximate increase 10 ppb O3 concentration 5.2 μg·m–3 SOA compared condition without operation, while increases about 1.2 μg·m–3, with minimal impact on concentration. Furthermore, increasing UV fluence rate from 1 5 μW·cm–2 results up 80% concentrations. For 254, elevating 30 50 or doubling radiating volume 50% Note indoor airflow patterns, particularly buoyancy-driven (or displacement ventilation), 15–45% lower well-mixed airflow. The also reveal when ventilation below 2 h–1, has smaller human exposure than 222. generate more at high levels (>15 ppb). These suggest design should consider room conditions.
Язык: Английский
Процитировано
4
Environmental Science & Technology, Год журнала: 2024, Номер 58(45), С. 20073 - 20080
Опубликована: Окт. 28, 2024
Germicidal ultraviolet lamps with a peak emission at 222 nm (GUV222) are gaining prominence as safe and effective solution to reduce disease transmission in occupied indoor environments. While previous studies have reported O
Язык: Английский
Процитировано
4