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With the rapid economic development in developing countries, air quality has been worsened in those areas. Respiratory diseases caused by air pollution have killed thousands of people, which impels local residents to wearing mask to protect them from harm. However, the mask itself also has its life limit. We can’t distinguish disabled with those still have some time to go. Therefore, here is a new kind of mask, which makes the hidden life-length of a mask visible and reminds users to change another one.