Why Wearing A Face Mask Outdoors Isn't Necessary

Each orange dot represents a dose of respiratory particles capable
of infecting someone if inhaled by breathing, speaking, and shouting

In the worst-case scenario (lower right corner) – shouting or singing in a closed space for an hour – a person with Covid-19 releases. 

Risk of coronavirus infection changes depending on the number of contagious particles you breathe in. El Pais illustrated the differences when you take certain measures, namely wearing masks, ventilation, and decreased exposure time.  The suggestions are based on statistical models, so there is more uncertainty than I think the explanations provide, but the sequence of illustrations provides a clear picture of what we can do — if you must do things indoors.

In the spring, health authorities failed to focus on aerosol transmission, but recent scientific publications have forced the World Health Organization (WHO) and the CDC to acknowledge it. An article in the prestigious Science magazine found that there is “overwhelming evidence” that airborne transmission is a “major transmission route” for the coronavirus, and the CDC now notes that, “under certain conditions, they seem to have infected others who were more than six feet [two meters] away. These transmissions occurred within enclosed spaces that had inadequate ventilation. Sometimes the infected person was breathing heavily, for example, while singing or exercising.”

At present, health authorities recognize three vehicles of coronavirus transmission: the small droplets from speaking or coughing, which can end up in the eyes, mouth, or nose of people standing nearby; contaminated surfaces (fomites), although the US Centers for Disease Control and Prevention (CDC) indicates that this is the least likely way to catch the virus, a conclusion backed by the European Center for Disease Control and Prevention’s (ECDC) observation that not a single case of fomite-caused Covid-19 has been observed; then finally, there is transmission by aerosols – the inhalation of invisible infectious particles exhaled by an infected person that, once leaving the mouth, behave in a similar way to smoke. Without ventilation, aerosols remain suspended in the air and become increasingly dense as time passes.

At the beginning of the pandemic, it was believed that the large droplets we expel when we cough or sneeze was the main vehicle of transmission. But we now know that shouting and singing in indoor, poorly ventilated spaces over a prolonged period of time also increases the risk of contagion. This is because speaking in a loud voice releases 50 times more virus-laden particles than when we don’t speak at all. These aerosols, if not diffused through ventilation, become increasingly concentrated, which increases the risk of infection. Scientists have shown that these particles – which we also release into the atmosphere when simply breathing and which can escape from improperly worn face masks – can infect people who spend more than a few minutes within a five-meter radius of an infected person, depending on the length of time and the nature of the interaction. In the following example, we outlined what conditions increase the risk of contagion in this situation.

If the buildings are properly ventilated, with good air conditioning,  there is less risk.  University of Colorado Boulder atmospheric chemist Jose-Luis Jimenez has released an airborne transmission pilot tool that may help us answer some of these questions, or at least provide some informed guidance. 

Popular Posts (Last 30 Days)

Topics

Activist ADE Advertising Air Quality Alchohol Antibody Antitrust Apple Apps Arizona Astra Zeneca Australia Bankruptcy Banks Banned Bars BBB Beaches Bell's Palsy Ben Shapiro Biden Big Pharma Big Tech Bill Gates BioNTech Blackmail Booster Business California Canada Cares Act CDC Censorship Chart Children China Class Action Clinical Trials Closures CNN Comirnaty Contact Tracing Corruption COVAX Cover Up Cuomo Data Deaths DeSantis Doctor Reiner Doctors DOJ Dominion Dr Reiner Dr Shiva Drugs ECDC Education Election Elon Musk Email Enforcement Europe Extortion Facebook Fake Laws Fake News Fake Tests Fake Vaccine False Positive Famotidine Fauci FBI FDA Fear Mongering Federal Reserve Feds Fines Florida Flu Flu Shots Fox France Fraud Free Speech Freedom FTC Gavin Newsom Geert Vanden Bossche Genome Glenn Beck Globalism Google Government Guillain-Barré Halloween Harvard Health Health Department Healthcare Heart Herd Immunity Hero Hospitals How To Humor Hydroxychloroquine Hypocrisy India Insurance Investment IRS Israel Italy Ivermectin J&J Japan Jeff Bezos Jobs Joe Rogan LA County Larry Elder Lawsuits Leadership Let Them Breathe Lies Loans Local Laws Lockdown Los Angeles Mandates Map Masks Media Medicaid Melatonin Mental Health Michigan Microsoft Minnesota Moderna Money Montana mRNA Mutation Myocarditis Nashville Natural Immunity New Jersey New York New Zealand Nextstrain NFL NIH Nursing Homes NY NY Post Ohio Opinion Opposing View Oppression Outdoors Parks Passport Patents PCR Pennsylvania Peter McCullough Pfizer Phishing Placebo Pneumonia Politics Poll Pollution PPP Prevention Pro Choice Project Veritas Protest Racism Rand Paul Real Estate Refuse Regeneron Relief Checks Remdesirvir Restaurants Restraining Order Robert Malone Rudy Giuliani Rumble Russia Safegraph SBA Scams Schools Science Scott Gottlieb Senate Seniors Side Effects Sidney Powell Social Distancing South Korea Spain Sports Stadiums Stakeholder Capitalism Stay at Home Study Substance Abuse Surveillance Sweden Swine Flu Symptoms Taxes Teachers Technology Testing Texas Tips Tony Bobulinski Transmission Treatment Trojan Horse Trump Tucker Carlson Twitter Tyranny UK Unemployment United Nations Vaccine VAERS Video Vietnam Vitamin D Warren Buffett Washington WEF Whistleblower WHO Wisconsin Women Workers Comp Zinc