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"The only real protection against airborne virus particles is with a full-faced positive-pressure respirator."

Not so.

Read this :

Sunlight destroys virus quickly, new govt. tests find, ... " ... The study found that the risk of “transmission from surfaces outdoors is lower during daylight” and under higher temperature and humidity conditions. “Sunlight destroys the virus quickly,” reads the briefing. ... "... Simulated sunlight “rapidly killed the virus in aerosols,” the briefing says, while without that treatment, “no significant loss of virus was detected in 60 minutes.” The tests were performed on viral particles suspended in saliva. They were done indoors in environments meant to mimic various weather conditions. While the results of these tests have not been previously made public, Harvey Fineberg, head of the National Academies Standing Committee on Emerging Infectious Diseases and 21st Century Health Threats, broadly described plans to conduct the experiments in an April 7 letter to the White House. In that letter, addressed to President Trump’s top science adviser Kelvin Droegemeier, Fineberg wrote that the DHS lab “is well suited for the kinds of studies they have planned, and the scope and relevance are noteworthy. In particular, they plan to create simulated infected body fluids, including saliva and lower respiratory secretions.” ... "... While the lab results are new, scientists for many weeks have predicted, based on available data on the disease’s spread, that warmer, wetter climates would be less hospitable to the spread of the coronavirus. An early analysis by scientists observed that the virus was spreading more slowly in countries with warmer climates. “We are not saying that at higher temperatures, the virus will suddenly go away and everything would be fine and you are going out,” Qasim Bukhari, a computational scientist at MIT and a co-author of the analysis, told Yahoo News in an interview. “No, we are not saying it. We are just seeing that there is a temperature- and humidity-related dependency, but I think many people now have started to realize this.” ... " ... While the new lab results are important, the science behind how sunlight kills the virus is fairly well established, says Arthur Anderson, former director of the Office of Human Use and Ethics at the United States Army Medical Research Institute of Infectious Diseases at Fort Detrick, Md. “[Ultraviolet] light breaks DNA into fragments. If the virus is floating around in the air and there’s bright sunlight, the UV component in sunlight will break the DNA or the RNA into pieces,” he told Yahoo News." ... " ... “Does this give a little more hope about the virus potentially decreasing?” said Dr. Kavita Patel, a Yahoo medical contributor and nonresident fellow at the Brookings Institution. “Yes. I would say even Dr. Fauci has alluded to that.” Colds and flus don’t disappear in the summer, even if they are less common, Patel noted. “We do have cases of the flu in the summer,” she said. “That’s why all of us in medicine are being a little more guarded.” The lab’s work was done in a controlled environment, according to the DHS briefing, and tested how long the coronavirus survives on stainless steel in a droplet of saliva from a cough or sneeze under conditions related to temperature, humidity and sunlight. The lab is now doing additional testing, such as experimenting with low-tech techniques for sterilization of protective equipment, which would include using rice cookers, clothes steamers and electric pressure cookers. The National Biodefense Analysis and Countermeasures Center, which conducted the experiments, has traditionally kept a low profile because of its classified work on biological warfare defense and bioterrorism. Fineberg, in his letter to the White House, did not go into detail on the planned experiments, noting that the lab shares its findings with the interagency task force on the coronavirus. It is unclear for now whether the center intends to publish in a peer-reviewed journal or choose some other route for making its results known. Patel said she could understand government concerns about releasing preliminary results, but in general she leans toward openness. “As a clinical doctor, we want to learn as fast as possible anything that works clinically. You want to be able in the first line to say: This is preliminary, with caveats. But why hold back the information?” she said. " ...