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Most of the citizens have to wear a dust mask to protect themselves, and the longer you wear the mask, the heavier bacteria it adhere. However, we don’t know the level of bacteria and when to replace our dusk mask. Therefore, this product is design to reach the visualization of bacteria in a dusk mask. The bacteria level is relate to the inside color of the mask, which remind people to replace the dusk mask.
Guangdong University of Technology