Ok, but where's the science? That's tight, there is none. Still waiting for actual science, not your opinion. I'll start.
Exhibit A
View attachment 16751
So you very clearly DIDNT read the article. It was absolutely loaded with scientific evidence. This is a simple one that I think even you can understand.
Aerosol Filtration Efficiency of Common Fabrics Used in Respiratory Cloth Masks
Abhiteja Konda, Abhinav Prakash, Gregory A. Moss, Michael Schmoldt, Gregory D. Grant, and Supratik Guha*
Cite this: ACS Nano 2020, 14, 5, 6339–6347
Publication Date:April 24, 2020
Go ahead and read it, I’ll wait.
Oh...you’re not going to read it, are you? Because it doesn’t fit with your Me Against The World ideology. At the very least stop saying that they don’t work. If you don’t want to wear one, fine. But stop lying. There are children here on the forum who likely look up to you. To provide misinformation to them is abhorrent. They came here to discuss the game, they didn’t consent to a QAnon Facebook post.
For others, here is the part of the article that confirms that everyday material DOES decrease particle inhalation of various sizes. But really, we are all using them to prevent OUR PARTICLES from escaping. But this should be enough to chew on. Results are listed under README, if you want to skip ahead.
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Although the detailed transmission specifics of SARS-CoV-2 virus are not well understood yet, droplets that are below 5 μm are considered the primary source of transmission in a respiratory infection,(13,15,34) and droplets that are smaller than 1 μm tend to stay in the environment as aerosols for longer durations of up to 8 h.(19) Aerosol droplets containing the SARS-CoV-2 virus have been shown to remain suspended in air for ∼3 h.(13,35) We have therefore targeted our experimental measurements in the important particle size range between ∼10 nm and 6 μm.
We tested the performance of over 15 natural and synthetic fabrics that included materials such as cotton with different thread counts, silk, flannel, and chiffon. The complete list is provided in the Materials and Methods section. For comparison, we also tested a N95 respirator and surgical masks. Additionally, as appropriate, we tested the efficiency of multiple layers of a single fabric or a combination of multiple fabrics for hybrid cloth masks in order to explore combinations of physical filtering as well as electrostatic filtering.
Results and Discussion
Jump To
We determine the filtration efficiency of a particular cloth as a function of particle size (Figure 2) by measuring the concentration of the particles upstream, Cu (Figure 2a,b) and the concentration of the particle downstream, Cd (Figure 2c,d). Concentrations were measured in the size ranges of 10–178 nm (using the nanoscan tool) and 300 nm to 6 μm (using the optical particle sizer tool). The representative example in Figure 2 shows the case for a single layer of silk fabric, where the measurements of Cu and Cd were carried out at a flow rate of 1.2 CFM. Following the procedure detailed in the Materials and Methods section, we then estimated the filtration efficiency of a cloth from Cu and Cd as a function of aerosol particle size.
Figure 2
Figure 2. Particle concentration as a function of particle size at a flow rate of 1.2 CFM. Plots showing the particle concentration (in arbitrary units) upstream and downstream through a single layer of natural silk for particle sizes <300 nm (a,c) and between 300 nm and 6 μm (b,d). Each bin shows the particle concentration for at least six trials. The particle concentrations in panels (b) and (d) are given in log scale for better representation of the data. The y-axis scales are the same for panels "a" and "c"; and for panels "b" and "d".
READMEREADMEREADME
The results plotted in Figure 3a are the filtration efficiencies for cotton (the most common material used in cloth masks) with different thread counts (rated in threads per inch—TPI—and representative of the coarseness or fineness of the fabric). We compare a moderate (80 TPI) thread count quilter’s cotton (often used in do-it-yourself masks) with a high (600 TPI) cotton fabric sample. Additionally, we also measured the transmission through a traditional cotton quilt where two 120 TPI quilter’s cotton sheets sandwich a ∼0.5 cm batting (90% cotton–5% polyester–5% other fibers). Comparing the two cotton sheets with different thread counts, the 600 TPI cotton is clearly superior with >65% efficiency at <300 nm and >90% efficiency at >300 nm, which implies a tighter woven cotton fabric may be preferable. In comparison, the single-layer 80 TPI cotton does not perform as well, with efficiencies varying from ∼5 to ∼55% depending on the particle size across the entire range. The quilt, a commonly available household material, with a fibrous cotton batting also provided excellent filtration across the range of particle sizes (>80% for <300 nm and >90% for >300 nm).