I will post some of the difference between KN95 and N95 again for the benefit of forum readers. I have posted many times on this.
KN95 and N95 are not totally equivalent.
Meanwhile on the topic of N95 masks vs KN95 masks:
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You see the yellow straps going around the back of the mask in this picture. This is a requirement for N95 standard. Because it goes around the back of the head when you wear it, the seal is much better. However, this also makes it more uncomfortable.
Most of the KN95 seen outside of China are "civilian grade", they use earloops like the regular surgical masks. If you pay attention to the photos of healthcare workers in China, they are usually wearing the "medical grade" which has head straps. The earloops are much easier to put on and take off, which makes it more ideal for day to day use. The filtering "mask" is essentially the same though, basically a hybrid.
I am not totally sure any manufacturers shut down as
@KYli mentioned, but generally his statement matches my observation. I did not hear of many new domestic manufacturing lines of N95 popping up (surgical masks, are a different story, there are many new ones, probably equipment sold at a discount from China), suggesting the current capacity is enough.
What happened early on was a lot of misinformation, fabrications, profiteers, and confusion. Since there is no Western equivalent to "civilian grade" KN95, many of these were considered "not to N95 standard". This is fair, because even in China, they are not up to the medical standard. However, the news early on never made that entirely clear (Or even if they ever really knew). Obviously with this situation, there is going to be dishonesty and confusion on both ends. To the credit of the Chinese government, they tried very hard to crackdown on their end to protect the national reputation.
Actually the civilian KN95's continued importation into America is owing to the fact that it is considered a superior product compared to a regular disposable mask. Cost was mentioned, well KN95 cost is still more than an average earloop mask. It better established that it is not the same as N95, nor is it still being misrepresented like that. I think it helped that the NBA and NFL adopted them.
It is also now being produced in black colour often so it is not confused with a medical grade mask (since early on people were being hassled for "stealing" masks from healthcare workers due to the shortage)
Just wanted to add, actually now you see quite a few POSITIVE articles on KN95.