Light Kills Coronavirus
Light also provides protection against disease, including Covid-19. Virologists at the National Institute of Allergy and Infectious Diseases found that, inside the laboratory, the SARS-CoV-2 coronavirus remains stable on everyday materials like metals, plastic and cardboard for several days. But it wouldn't last anywhere near as long outside.
When researchers at the National Biodefense Analysis and Countermeasures Center exposed SARS-CoV-2 in simulated saliva to artificial sunlight (equivalent to a sunny day), 90% of viruses were inactivated within seven minutes.
I guess the thinking here is that people might lick the streets?
Mass Disinfection Spraying Truck To Combat Coronavirus Outbreak