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Masks N90 and N95 are the protection levels in the national mask standard. Different levels of protection represent the protection and filtering capabilities of masks, which are the ability to block dust, bacteria, and viruses.
The filtering capacity of N90 is worse than that of N95. The N90 mask can block 90% of the dust from the mask.
N95 is more resistant and may resist more than 95% of dust, bacteria, and viruses.
So the difference between N90 and N95 lies in the ability to block dust. If you need stronger protection, you need to choose a higher grade mask.