Xiaomi Mi Airpop Smog Mask Price in Bangladesh. Smart Mi KN95 smog face mask has anti-pollution protection that also gives off an element of style. It is reusable and designed for comfortable long term wear, produced by special TPU memory that integrates with sponge foam. The mask adapts to the shape of your face within a short time of wearing. It has a specially designed 3D skeletal structure that prevents distortion and provides breathing space up to 200 cm.