![]() ![]() ![]() The overall goal of this project is to provide an assessment to transportation agencies and the general public on the effectiveness of UV light-generating devices for the disinfection of surfaces contaminated with SARS-CoV-2. These measurements inform both the public transit agencies and the general public about the potential efficacy of UV light as part of routine cleaning and disinfection practices. Scientists, industry, and end users have noted a lack of standardized approaches related to UV light dose measurements, substrate materials, and inoculum matrices.Įxperimental UVC disinfection data for SARS-CoV-2 is currently limited to specific light sources with no assessment of the impact on efficacy of critical parameters such as inoculum media and substrate material.ĮPA is conducting UV disinfection efficacy measurements on surfaces common to public transportation settings. A review of the literature for efficacy data against viruses, including human coronaviruses, suggests that the dose necessary to inactivate 90% of SARS-CoV-2 (i.e., a one log reduction) is approximately (median of compiled data) 3.6 mJ/cm 2 or as high as 10 mJ/cm 2. ![]() When deployed, these UV light devices emit UVC light (200-280 nm wavelength), which is the most germicidal part of the UV spectrum by damaging nucleic acids, leading to inactivation of a pathogen. UV disinfection devices can serve as an additional method to routine cleaning practices and is commonly utilized in healthcare settings. UV radiation is a well-known inactivation approach for microorganisms that offers some advantages over liquid disinfectants as it can be performed automatically, remotely, and employed to disinfect surfaces, liquids, air, and rooms. Results for SARS-CoV-2 Surface Disinfection with UV- November 10, 2020 Interim Results for SARS-CoV-2 Surface Disinfection with UV- March 1, 2021 Disinfecting Surfaces with UV Light to Reduce Exposure to SARS-CoV-2 ![]()
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