under a range of temperatures, relative humidity, and UV index
Use the sliders to select the UV index, temperature and relative humidity of interest. Information on how long SARS-CoV-2 would be expected to remain stable in aerosols (airborne) will be displayed in the table below. Users can find the environmental conditions for a specific location by accessing general weather resources online.
SARS-CoV-2 Airborne Decay Calculator
|% Virus Decay||Minutes||Hours|
- Minimizing person-to-person spread of SARS-CoV-2 is one of the main ways to reduce the impact of COVID-19.
- Transmission is believed to occur through respiratory droplets produced by talking, coughing and sneezing. Contact with contaminated surfaces and objects may also contribute to spread.
- Increased temperature and relative humidity cause a minimal increase in SARS-CoV-2 decay, but the addition of simulated sunlight causes rapid decay of the virus in aerosol.
- These data have been used to develop a predictive model to estimate virus decay in aerosols under a limited range of environmental conditions.
- The data that supports this tool is published in the Journal of Infectious Diseases and can be found here.
- It should be noted that in order to fully assess the hazard posed by aerosols containing SARS-CoV-2, additional information is needed, including how much infectious virus is shed by infected individuals into the air, and the amount of virus that needs to be inhaled to cause infection.
- The tool is valid for the following ranges of conditions: 50-86°F, 20-70% relative humidity, and UV indices of 1-10. The model currently doesn’t allow for a UV index of 0. The model will be upgraded to expand the parameters for future iterations.