Beijing Key Laboratory of Green Built Environment and Energy Efficient Technology, Beijing University of Technology, Beijing, China.
School of Architecture, Tsinghua University, Beijing, China.
J Hazard Mater. 2023 Sep 15;458:132069. doi: 10.1016/j.jhazmat.2023.132069. Epub 2023 Jul 16.
Close contact routes, including short-range airborne and large-droplet routes, play an important role in the transmission of SARS-CoV-2 in indoor environments. However, the exposure risk of such routes is difficult to quantify due to the lack of data on the close contact behavior of individuals. In this study, a digital wearable device, based on semi-supervised learning, was developed to automatically record human close contact behavior. We collected 337,056 s of indoor close contact of school and university students from 194.5 h of depth video recordings in 10 types of indoor environments. The correlation between aerosol exposure and close contact behaviors was then evaluated. Individuals in restaurants had the highest close contact ratio (64%), as well as the highest probability of face-to-face pattern (78%) during close contact. Accordingly, university students showed greater exposure potential in dormitories than school students in homes, however, a lower exposure was observed in classrooms and postgraduate student offices in comparison with school students in classrooms. In addition, restaurants had the highest aerosol exposure volume for both short-range inhalation and direct deposition on the facial mucosa. Thus, the classroom was established as the primary indoor environment where school students are exposed to aerosols.
密切接触途径，包括短程空气传播和大飞沫传播途径，在室内环境中 SARS-CoV-2 的传播中起着重要作用。然而，由于缺乏关于个人密切接触行为的数据，这些途径的暴露风险很难量化。在这项研究中，我们开发了一种基于半监督学习的数字可穿戴设备，用于自动记录人体的密切接触行为。我们从 10 种室内环境中 194.5 小时的深度视频记录中收集了 337,056 秒的学校和大学生室内密切接触数据。然后评估了气溶胶暴露与密切接触行为之间的相关性。在餐厅的个体具有最高的密切接触比例（64%），以及在密切接触期间最高的面对面模式概率（78%）。因此，与家中的学生相比，大学生在宿舍的暴露风险更大，然而，与教室中的学生相比，他们在教室和研究生办公室的暴露风险较低。此外，餐厅具有最高的短程吸入和直接沉积在黏膜上的气溶胶暴露量。因此，教室被确定为学生暴露于气溶胶的主要室内环境。
