The public-health significance of far-UVC-induced indoor ozone and its associated secondary chemistry.

IF 2.6 4区 生物学 Q3 BIOCHEMISTRY & MOLECULAR BIOLOGY Photochemistry and Photobiology Pub Date : 2024-09-01 Epub Date: 2023-11-30 DOI:10.1111/php.13892
David J Brenner
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Abstract

There has been much recent interest in whole-room far-UVC (wavelength around 222 nm) to markedly and safely reduce overall levels of airborne pathogens in occupied indoor locations. Far-UVC light produces very low levels of ozone-in real-world scenarios induced ozone levels of less than 10 ppb, and much less in moderately or well-ventilated rooms compliant with US far-UVC dose recommendations, and very much less in rooms compliant with international far-UVC dose standards. At these very low ozone levels, there is no epidemiological evidence of increased health risks from any of the very large outdoor ozone studies, whether from ozone alone or from ozone plus associated pollutants. Indoors, at the low ozone concentrations of relevance here, ozone does not react rapidly enough with preexisting airborne volatile organic compounds to compete with even extremely low levels of room ventilation, so significant ozone-induced ultrafine particle production is very unlikely. Direct measurements in real-life room scenarios are consistent with these conclusions. A potential exception is the cleaning material limonene, which has an unusually high ozone interaction cross-section; in the far-UVC context, turning off far-UVC lights during cleaning with limonene products would be reasonable.

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远紫外线诱发的室内臭氧及其相关二次化学的公共卫生意义。
最近,人们对整个房间的远紫外线(波长约222纳米)有了很大的兴趣,以显着和安全地降低室内空气传播病原体的总体水平。远紫外线光产生的臭氧水平非常低——在实际情况下,臭氧水平低于10 ppb,在符合美国远紫外线剂量建议的适度或通风良好的房间里,臭氧水平要低得多,而在符合国际远紫外线剂量标准的房间里,臭氧水平要低得多。在这些极低的臭氧水平下,没有流行病学证据表明任何大型室外臭氧研究增加了健康风险,无论是臭氧本身还是臭氧加上相关污染物。在室内,在此处相关的低臭氧浓度下,臭氧与空气中预先存在的挥发性有机化合物的反应速度不够快,甚至无法与极低水平的室内通风竞争,因此臭氧诱导的显著超细颗粒产生的可能性很小。在真实的房间场景中进行的直接测量与这些结论一致。一个潜在的例外是清洁材料柠檬烯,它具有异常高的臭氧相互作用截面;在远紫外线的情况下,在用柠檬烯产品清洁时关闭远紫外线灯是合理的。
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来源期刊
Photochemistry and Photobiology
Photochemistry and Photobiology 生物-生化与分子生物学
CiteScore
6.70
自引率
12.10%
发文量
171
审稿时长
2.7 months
期刊介绍: Photochemistry and Photobiology publishes original research articles and reviews on current topics in photoscience. Topics span from the primary interaction of light with molecules, cells, and tissue to the subsequent biological responses, representing disciplinary and interdisciplinary research in the fields of chemistry, physics, biology, and medicine. Photochemistry and Photobiology is the official journal of the American Society for Photobiology.
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