最近開始很多人都會說醫療口罩要戴兩層，這個是很錯誤的觀念，所以在這邊前往提醒大家不要這樣做
原文：
https://www.cdc.gov/coronavirus/2019-ncov/your-health/effective-masks.html
就像是保險套戴兩層更容易破一樣的概念，一般醫療口罩的過濾率其實本來就不高，主要就是要防止飛沫噴灑而已，多數氣體還是從邊緣滲漏。
此時如果你強行佩戴兩層口罩，只會讓邊緣的空隙更多，CDC另外指出兩層口罩可能會阻礙某些佩戴者的呼吸或阻礙周圍的視力。
請參考口罩防護能力
所以千萬不要做這樣的事，最好的方式就是：
1.減少與人群接觸，
2.勤洗手跟消毒，
3.正確佩戴你的口罩（請參考：口罩帶正面或是反面有差嗎？）
其他相關資料：
Double masking amid COVID-19 not backed by research, experts say
https://www.r-ccs.riken.jp/wp/wp-content/uploads/2021/03/210304tsubokura.pdf
Improve How Your Mask Protects You
Correct and consistent mask use is a critical step everyone can take to prevent getting and spreading COVID-19. Masks work best when everyone wears them, but not all masks provide the same protection. When choosing a mask, look at how well it fits, how well it filters the air, and how many layers it has.
Make sure your mask fits snugly against your face. Gaps can let air with respiratory droplets leak in and out around the edges of the mask
Pick a mask with layers to keep your respiratory droplets in and others’ out. A mask with layers will stop more respiratory droplets getting inside your mask or escaping from your mask if you are sick.
For more information on science behind improving how your mask protects you, see Improve the Fit and Filtration of Your Mask to Reduce the Spread of COVID-19.
For more information on wearing a mask and personal protective equipment in healthcare workplaces, see Interim Infection Prevention and Control Recommendations for Healthcare Personnel During the Coronavirus Disease 2019 (COVID-19) Pandemic.
Choose a mask with a nose wire
- A nose wire is a metal strip along the top of the mask
- Nose wires prevent air from leaking out of the top of the mask.
- Bend the nose wire over your nose to fit close to your face.
Use a mask fitter or brace
- Use a mask fitter or brace over a disposable mask or a cloth mask to prevent air from leaking around the edges of the mask.
Check that it fits snugly over your nose, mouth, and chin
- Check for gaps by cupping your hands around the outside edges of the mask.
- Make sure no air is flowing from the area near your eyes or from the sides of the mask.
- If the mask has a good fit, you will feel warm air come through the front of the mask and may be able to see the mask material move in and out with each breath.
Add layers of material
真的不得已的時候可以使用另外一種材質的口罩來做外側保護，但是要注意口罩是否貼合以及呼吸是否順暢
2 ways to layer
- Use a cloth mask that has multiple layers of fabric.
- Wear a disposable mask underneath a cloth mask.
- The cloth mask should push the edges of the disposable mask against your face.
Make sure you can see and breathe easily
Knot and tuck ear loops of a 3-ply mask
- Knot the ear loops of a 3-ply face mask where they join the edge of the mask
- Fold and tuck the unneeded material under the edges
- For instructions, see the following https://youtu.be/GzTAZDsNBe0.
Other things to consider
可以另外使用口罩的固定架加強口罩的密合度，或是在醫療口罩的外側加一層比較小的布口罩來增加使用期限，但是仍需注意口罩是否有貼合臉部，除此之外，布面口罩的使用一樣要注意避免正面接觸到其他位置造成感染。
Certain types of facial hair, like beards, can make mask fitting difficult. People with beards can do one or more of the following:
- Shave their beards.
- Trim their beards close to the face.
- Use a mask fitter or brace.
- Wear one disposable mask underneath a cloth mask that has multiple layers of fabric. The second mask should push the edges of the inner mask snugly against the face and beard.
Masks designed for people with beards are being evaluated, and information will be provided when it becomes available.
Combine two disposable masks
- Disposable masks are not designed to fit tightly and wearing more than one will not improve fit.
Combine a KN95 mask with any other mask.
- Only use one KN95 mask at a time.
或是直接單張教學版
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