Yuguo Li

Chair Professor of Building Environment
Hong Kong University
Participates in 1 Session

Speaker Topic:

"Dilution for avoiding SARS-CoV-2 transmission"

The COVID-19 pandemic has generated new data and knowledge for understanding the transmission respiratory infection in air. I shall argue that the transmission of SARS-CoV-2 has been predominated by the inhalation route, although the roles of short- and long-range inhalation may differ for the Omicron variant and those earlier ones. The most important transmission phenomenon is the less or rare occurrence of outdoor transmission, and most observed outbreaks with measured ventilation rates occurred in spaces without sufficient dilution. Effective dilution can be achieved by ventilation, filtration, airborne pathogen deactivation, and/or spaciousness. It appears that the dilution requirement for avoid Omicron transmission is much higher than that for early variants. mass wearing of surgical masks seems to be effective with most of indoor spaces for early variants of SARS-CoV-2, while insufficient for Omicron variant. There is a need for studying transmission of air-related diseases and associated air hygiene, just as we did for water-related diseases and associated water hygiene.

Speaker Biography:

Yuguo Li is a Chair Professor of Building Environment at HKU. His current research topics include city climate, environment studies of infection and indoor environment. He serves as Editor-in-Chief of Indoor Air. Since early 2020, he has collaborated with WHO, Guangdong CDC, Hunan CDC, Jiangsu CDC, and Hong Kong EPD and studied the transmission routes of SARS-CoV-2 in buildings. He is a member of the WHO IPC GDG and WHO Environment and Engineering Control Expert Advisory Panel (ECAP) for COVID-19.

Sessions in which Yuguo Li participates

Thursday 28 July, 2022

Time Zone: (GMT-05:00) Eastern Time (US & Canada)
8:30 AM
8:30 AM
Tianzhen Hong
Keynote speaker
Lawrence Berkeley Nation...
Senior Scientist and Dep...
Yuguo Li
Keynote speaker
Hong Kong University
Chair Professor of Build...

Sessions in which Yuguo Li attends

Wednesday 27 July, 2022

Time Zone: (GMT-05:00) Eastern Time (US & Canada)
8:30 AM
8:30 AM
Colleen Mercer Clarke
Keynote speaker
International Federation...
Landscape Architect and ...
Andrew Persily
Keynote speaker
U.S. National Institute ...
Building Energy and Envi...