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Author:

Chen, Wenzhao (Chen, Wenzhao.) | Qian, Hua (Qian, Hua.) | Zhang, Nan (Zhang, Nan.) (Scholars:张楠) | Liu, Fan (Liu, Fan.) | Liu, Li (Liu, Li.) | Li, Yuguo (Li, Yuguo.)

Indexed by:

EI Scopus SCIE

Abstract:

Debate and scientific inquiries regarding airborne transmission of respiratory infections such as COVID-19 and influenza continue. Health authorities including the WHO and the US CDC have recognized the airborne transmission of COVID-19 in specific settings, although the ventilation requirements remain to be determined. In this work we consider the long-range airborne transmission as an extended short-range airborne route, which reconciles the link between short- and long-range airborne routes. The effective short-range distance is defined as the distance in short range at which long-range route has the same volumetric exposure value as that due to short-range route. Our data show that a decrease in ventilation rate or room volume per person, or an increase in the ratio of the number of infected to susceptible people reduces the effective short-range distance. In a normal breathing scenario with one out of five people infected and a room volume of 12 m3 per person to ensure an effective short-range distance of 1.5 m, a ventilation rate of 10 L/s per person is needed for a duration of 2 h. Our results suggest that effective environmental prevention strategies for respiratory infections require appropriate increases in the ventilation rate while maintaining a sufficiently low occupancy. Practical implications: Demonstration of the long-range airborne route as an extended short-range airborne route suggests the significant role played by building ventilation in respiratory infection exposure. The reconciliation of short- and long-range airborne transmission suggests that the commonly observed dominance of close-contact transmission is a probable evidence of short-range airborne transmission, following a separate earlier study that revealed the relative insignificance of large droplet transmission in comparison with the short-range airborneroute. Existing ventilation standards do not account for respiratory infection control, and this study presents a possible approach to account for infection under new ventilation standards.

Keyword:

COVID-19 Airborne transmission Ventilation rate Crowding Indoor environment

Author Community:

  • [ 1 ] [Chen, Wenzhao]Univ Hong Kong, Dept Mech Engn, Pokfulam Rd, Hong Kong, Peoples R China
  • [ 2 ] [Li, Yuguo]Univ Hong Kong, Dept Mech Engn, Pokfulam Rd, Hong Kong, Peoples R China
  • [ 3 ] [Qian, Hua]Southeast Univ, Sch Energy & Environm, Nanjing, Peoples R China
  • [ 4 ] [Liu, Fan]Southeast Univ, Sch Energy & Environm, Nanjing, Peoples R China
  • [ 5 ] [Zhang, Nan]Beijing Univ Technol, Beijing Key Lab Green Built Environm & Energy Eff, Beijing, Peoples R China
  • [ 6 ] [Liu, Li]Tsinghua Univ, Sch Architecture, Beijing, Peoples R China

Reprint Author's Address:

  • [Li, Yuguo]Univ Hong Kong, Dept Mech Engn, Pokfulam Rd, Hong Kong, Peoples R China

Email:

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Source :

JOURNAL OF HAZARDOUS MATERIALS

ISSN: 0304-3894

Year: 2022

Volume: 422

1 3 . 6

JCR@2022

1 3 . 6 0 0

JCR@2022

ESI Discipline: ENGINEERING;

ESI HC Threshold:49

JCR Journal Grade:1

CAS Journal Grade:1

Cited Count:

WoS CC Cited Count: 31

SCOPUS Cited Count: 34

ESI Highly Cited Papers on the List: 0 Unfold All

WanFang Cited Count:

Chinese Cited Count:

30 Days PV: 3

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