you need to read this article
This is a long read, and I really suggest going into it if you have the time, but here are the main points:
Throughout the early pandemic, the CDC and WHO insisted that COVID was spread through droplets, not through aerosols, insisting that to be considered 'airborne' it had to travel on particles 5 microns or smaller. Anything larger was a 'droplet', which would fall quickly and stick to surfaces, explaining the emphasis on social distancing and surface sanitation.
Aerosol scientist and infectious disease researcher Lindsey Marr, along with others such as atmospheric physicist Lidia Morawska, argued that made no sense. Depending on temperature, humidity, ventilation, etc much larger could easily travel large distances through the air. They presented evidence like choir practice superspreader events, which droplets couldn't explain. The WHO shut them down, insisting on the 5-micron fulcrum.
Marr wanted to find out where everyone was getting the 5 micron number, because everything quoted it like fact. She communicated with Hong Kong indoor-air researcher Yuguo Li who had come to similar conclusions. With the help of grad student Katie Randall's forensic approach to research, they eventually tracked down where the number came from:
Tuberculosis.
In experiments from the 40's and 50's, only guinea pigs who had been exposed to aerosolized TB particles 5 microns or smaller contracted the disease. The problem is, tuberculosis is SUPER PICKY. If It doesn't get all the way through your respiratory system into your lungs, it doesn't cause an infection.
The 5-micron limit has been applied to every disease since, but no other respiratory infection is that picky. If enough viral particles of COVID, or the flu, or the common cold lands anywhere in your respiratory system it can get a foothold.
Very slowly and quietly, the CDC and WHO has changed its stance on aerosolization, and the importance of ventilation and mask-wearing indoors. This article argues it was too little too late, and caused too many unnecessary deaths.
I read about this way back in July, when the group of scientists and physicians first sent a huge petition to WHO to change their guidelines, and I’ve been trying to tell people about it ever since. Because what you need to do to protect from aerosols is very different from what you need to do to protect from droplets and this is killing people by the hundreds of thousands.
So here’s what we know about what ACTUALLY protects people from COVID. Basic definition of terms: an aerosol is a gas/vapor. It’s the air from your lungs. Physically it acts like steam or smoke.
Not significantly helpful:
I’m not telling you this to say, like, “don’t do these things”, but so you know that doing these things does not make you safe. You need to do the things in the second list.
1) 6 feet. I’m sorry. I know this has been your guiding life principle for the last year. The WHO and CDC lied to you. This is not a conspiracy anti-mask dumbass thing. They actually did. That’s the biggest thing about aerosols vs droplets: droplets stop at six feet. Aerosols DO NOT. You can be all the way on the other side of a church service or a wedding or a whatever and get COVID. That’s how superspreader events happen. (You know how everyone’s het up about the CDC saying vaccinated people don’t have to be six feet apart? It’s... not actually about the vaccination. They just know now that 6 feet didn’t help significantly in the first place.)
2) Sanitizing objects. It’s not very specifically mentioned in this particular article, but was part of what they said back in July: “fomites” - contaminated objects - are just... not a factor in COVID at all. All that Lysoling of chairs and shit is pointless. Probably don’t watch someone cough on a counter and then immediately lick it, but we’ve known for more than a year that tables, chairs, railings, etc cannot pass COVID.
3) Handwashing. Please... please do wash your hands, there are many other things you transmit/get from your hands. COVID is however not one of them. Hands fall under the category of “fomites”. Again, don’t put your hand right into your mouth seconds after someone coughs on it, but since COVID is actually passing through air there’s like... not much air that sticks on your hand??? The amount of virus that sticks to your hand is not enough to give you COVID. Also COVID infects you through your lungs not your skin.
4) Bad masks. While wearing a mask is good, many (most!) sorts of masks actually make the problem worse. Your goal isn’t to block droplets from shooting forward, it’s to stop aerosol - gas - from getting, well, anywhere. An ill-fitting mask that has a gap between the mask and your cheeks will cause aerosol to blow backwards at people behind you. A mask that doesn’t have wire at the top will blow the aerosol upwards where it can settle back down all over the room. A bandana, or a mask not covering your nose, or a face shield, or a mask with a valve or a hole, will do absolutely fuck-all.
Things that do help:
In summary, the NUMBER ONE THING - the factor that controls like 95% of risk - that we now know matters (as of a year ago, fuck you, WHO) is air flow/ventilation.
1) Being outdoors. This the single best way to avoid COVID. Being in an outdoor area with free airflow is the best thing you can do by miles, I cannot emphasize this enough. This is why protests weren’t superspreader events. An outdoor area with restricted airflow (like between buildings) is not as good but is still infinitely safer than being six feet away from someone with masks indoors.
2) Proper air circulation. If you have to be inside and have any control over the building, open the doors and windows. Put fans blowing air outside. Turn on the bathroom and stove exhaust fans. If nothing else stand near the door.
3) Air filtration. Get. a. HEPA. cleaner. These filter virus out of the air. A properly used HEPA cleaner cuts indoor virus risk to almost as low as being outdoors.
4) Air filtration part 2. If you have full control over a building, revamp the HVAC system. You need a system that recirculates large amounts of air continuously and filters it to medical standards. If it’s just your home, make sure your HVAC system has a good filter on it. Pressure businesses and airlines to update their air filtration.
5) Good masks. Remember: the mask has to stop air. Not droplets. If air can get in or out anywhere around your mask, the mask is NOT HELPING. Your mask needs to have a wire at the top to stop gaps around your nose and to fit smoothly against your cheeks. If the mask isn’t layered enough to filter air it is also not helping.
6) Get. Fucking. Vaccinated. We didn’t know at first but we do know now that the COVID vaccine is incredibly effective. Like, way more than most vaccines. (Get all your vaccines. But they all do leave some risk of both getting and transmitting the disease, which is one of the reasons we need herd immunity. The COVID vaccine has a way lower lingering risk.) It keeps you safe and it keeps everyone else safe.
