In order to promote the improvement of indoor air quality in public and private places, and to include diverse places to voluntarily participate in the maintenance of the public use environment, the MOENV issued on July 2, 2021 the "General Description of Operation Directions for Self-management Mark of Indoor Air Quality, MOENV, Executive Yuan" to encourage public and private places have obtained self-management marks, which are divided into excellent and good marks to jointly promote the self-management of public and private places, enhance corporate image, and maintain public health.