The difference between Chaomei and Chaoxia dust masks lies in quality and price.
There are two types of disposable masks from North Korea and the United States. One is an ordinary dust mask with an activated carbon layer in the middle. It is light and soft in texture, soft to the touch, has good breathability, and has thermal insulation, It has water absorption and waterproof functions, and the price is relatively low, making it suitable for daily use when going out. There is also the KN95 series of disposable dust masks, which have a filtration efficiency of 95 and set the standard coefficients of inhalation resistance and exhalation resistance of dust masks. They are suitable for people who are engaged in and exposed to dust and are slightly more expensive. Note that these two items cannot be used again after cleaning.
Zhaoxia dust-proof disposable masks have a filtration efficiency of 95. The mask comes with a breathing valve, so you can breathe smoothly while wearing it. The mask uses an ear-hook ear strap design, which is more convenient to wear. At the same time, an adjustable plastic nose clip strip is added to the top of the mask to make the breathing part very tight. Overall, it is very good. Regarding the price of Zhaoxia dust-proof masks, the price of a disposable Zhaoxia dust-proof mask is around 0.3-0.5 yuan, which is relatively affordable.