Independent and Interactive Effects of Environmental Conditions on Aerosolized Surrogate SARS-CoV-2 — Beijing, China, June to September 2020

What is already known about this topic? Environmental factors such as temperature and humidity play important roles in the transmission of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) via droplets/aerosols. What is added by this report? Higher relative humidity (61%–80%), longer spreading time (120 min), and greater dispersal distance (1 m) significantly reduced SARS-CoV-2 pseudovirus loads. There was an interaction effect between relative humidity and spreading time. What are the implications for public health practice? The findings contribute to our understanding of the impact of environmental factors on the transmission of SARS-CoV-2 via airborne droplets/aerosols.

[1]  G. Ichihara,et al.  Higher viral load and infectivity increase risk of aerosol transmission for Delta and Omicron variants of SARS-CoV-2. , 2022, Swiss medical weekly.

[2]  C. Macintyre,et al.  Filtration efficiency of face masks against aerosolized surrogate SARS-CoV-2 at different social distances , 2021, Science Bulletin.

[3]  C. Macintyre,et al.  Wearing time and respiratory volume affect the filtration efficiency of masks against aerosols at different sizes , 2021, Environmental Technology & Innovation.

[4]  B. Lee.  Why Does the SARS-CoV-2 Delta VOC Spread So Rapidly? Universal Conditions for the Rapid Spread of Respiratory Viruses, Minimum Viral Loads for Viral Aerosol Generation, Effects of Vaccination on Viral Aerosol Generation, and Viral Aerosol Clouds , 2021, International journal of environmental research and public health.

[5]  Z. Avazzadeh,et al.  Dynamics of respiratory droplets carrying SARS-CoV-2 virus in closed atmosphere , 2020, Results in Physics.

[6]  Yi Cui,et al.  COVID-19: Effects of Environmental Conditions on the Propagation of Respiratory Droplets , 2020, Nano letters.

[7]  M. Lackemeyer,et al.  Persistence of Severe Acute Respiratory Syndrome Coronavirus 2 in Aerosol Suspensions , 2020, Emerging infectious diseases.

[8]  B. Liu,et al.  Aerosol and Surface Distribution of Severe Acute Respiratory Syndrome Coronavirus 2 in Hospital Wards, Wuhan, China, 2020 , 2020, Emerging infectious diseases.

[9]  L. Bourouiba,et al.  Natural sources and experimental generation of bioaerosols: Challenges and perspectives , 2020, Aerosol Science and Technology.

[10]  Frank Arnold,et al.  The role of relative humidity in continental new particle formation , 2011 .

[11]  William G. Lindsley,et al.  Measurements of Airborne Influenza Virus in Aerosol Particles from Human Coughs , 2010, PloS one.

[12]  Chang-Yu Wu,et al.  Method for contamination of filtering facepiece respirators by deposition of MS2 viral aerosols , 2010, Journal of Aerosol Science.

[13]  John Steel,et al.  Influenza Virus Transmission Is Dependent on Relative Humidity and Temperature , 2007, PLoS pathogens.