Original title: Main differences between KN95 mask test standard GB2626-2019 and GB2626-2006 How to handle the mask quality inspection report GB2626? Masks are often used in our life and work. For example, when the air quality is not very good, when there is a lot of dust in the working environment, when it is cold in winter, and when it is needed for work, masks are needed. So how to deal with...