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Classroom aerosol dispersion: desk spacing and divider impacts
1Department of Geography and Environmental Engineering, United States Military Academy, 745 Brewerton Road, West Point, NY 10996 USA.
International Journal of Environmental Science and Technology : IJEST
|August 4, 2021
Summary
Classroom aerosol dispersion, simulating infectious droplets, was studied. Desk spacing and dividers significantly impacted concentration levels, with dividers generally reducing spread, offering insights for safer learning environments.
Area of Science:
- Environmental Science
- Public Health
- Aerosol Science
Background:
- Understanding aerosol dispersion in shared spaces is crucial for mitigating disease transmission.
- Classrooms present unique challenges due to close proximity and shared air.
- Previous studies often lack granular data on single-source impact within realistic classroom setups.
Purpose of the Study:
- To investigate the influence of a single infectious student on aerosol concentration within a university classroom.
- To evaluate the impact of desk spacing (spread vs. compressed) and desk dividers on aerosol dispersion.
- To provide data for optimizing classroom layouts for improved air quality and reduced transmission risk.
Main Methods:
- Utilized carbon dioxide (CO2) tracer gas to simulate infectious aerosol droplets from a single source.
- Tested two desk spacing configurations: spread and compressed.
- Assessed the effect of three-sided clear desk dividers on tracer gas concentration.
- Monitored tracer gas levels at 13 locations, including student desks, instructor area, and ceiling vent.
Main Results:
- Desk spacing significantly affected tracer gas concentration, particularly at desks near the source.
- The use of desk dividers generally reduced overall student and instructor tracer concentrations.
- Consistent trends were observed despite variations in air change rates.
Conclusions:
- Desk spacing and physical barriers like dividers are effective strategies for managing aerosol dispersion in classrooms.
- The study provides a systematic method for evaluating classroom configurations for aerosol control.
- Findings can inform the design of safer educational spaces to minimize airborne disease transmission.
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