Inactivation times from 290 to 315 nm UVB in sunlight for SARS coronaviruses CoV and CoV-2 using OMI satellite data for the sunlit Earth.

摘要: UVB in sunlight, 290–315 nm, can inactivate SARS CoV and CoV-2 viruses on surfaces the air. Laboratory exposure to ultraviolet irradiance UVC range inactivates many bacteria times less than 30 min. Estimated inactivation doses from sunlight J/m2 are obtained measurements radiative transfer calculations, weighted by a virus action spectrum, using OMI satellite atmospheric data for ozone, clouds, aerosols. For CoV, an assumed dose near mid-range of measured values, D90 = 40 J/m2, 90% T90 estimated midday 10:00–14:00 direct plus diffuse nearby locations shade (diffuse only). model applicable viruses, calculated estimates show that noon 11:00–13:00 clear-sky gives values < 90 min mid-latitude sites between March September 60 equatorial 12 months year. Recent causes COVID-19 shorter 10 depending latitude, season, hour. The equivalent 254 nm is as 3.2 ± 0.7 steel mesh surface 6.5 1.4 growth medium. ranges 4 zone geographic area forming circle with solar zenith angle 60O centered subsolar point local 09:00 15:00 h.