The Spring rain and breeze know the season. The fine rain has moistened everything in silence. There comes a good piece of news, which is like a breath of fresh purified air. The board of Chengdu Meishi International School (CMIS) cares very much about how to help students grow up healthy and strong. To improve indoor air quality (IAQ), the school board has decided to install air purifiers (ventilation system) in all classrooms during the summer vacation 2017.