Related Experiment Video
Updated: Nov 21, 2025
09:29
An Air-liquid Interface Bronchial Epithelial Model for Realistic, Repeated Inhalation Exposure to Airborne Particles for Toxicity Testing
Published on: May 13, 2020
12.1K
Aerosolized SARS-CoV-2 exposure assessment: dispersion modeling with AERMOD
Mostafa Rezaali1, Reza Fouladi-Fard2
1Independent Researcher, (Formerly: Department of Civil and Environmental Engineering, Qom University of Technology, Qom, Iran), Isfahan, Iran.
Journal of Environmental Health Science & Engineering
|January 18, 2021
Summary
Airborne SARS-CoV-2 can travel over 9 meters. This study modeled virus dispersion, finding particle size and source height significantly impact exposure risk outdoors, informing public health guidance.
Area of Science:
- Environmental Science
- Public Health
- Aerodynamics
Background:
- COVID-19 pandemic highlights knowledge gaps in SARS-CoV-2 transmission.
- Emerging evidence suggests airborne transmission is a significant route for SARS-CoV-2.
- Public health recommendations increasingly emphasize outdoor mask-wearing.
Purpose of the Study:
- To model the dispersion of SARS-CoV-2-laden PM10 particles in an outdoor environment.
- To assess how particle size, wind speed, and source height influence airborne virus exposure risk.
- To provide data-driven insights for mitigating SARS-CoV-2 exposure.
Main Methods:
- Utilized the AERMOD atmospheric dispersion model, a validated tool recommended by the USEPA.
- Simulated various scenarios, including variations in particle size (0.01–2.5 μm), wind speed, and source height.
- Analyzed model outputs to determine the spatial distribution and concentration of virus-laden particles.
Main Results:
- Wind speed primarily narrows the infectious plume rather than reducing peak concentration.
- Smaller particles (0.01–2.5 μm) can travel over 9 meters, maintaining significant concentrations.
- Source height influences plume displacement; combined scenarios show height has a greater impact than wind speed on peak displacement.
Conclusions:
- Airborne SARS-CoV-2 can be transported outdoors up to 9 meters from an infected source.
- Particle size and source height are critical factors determining outdoor airborne virus exposure.
- Findings support public health measures and inform strategies to reduce transmission risk in outdoor settings.
