Due to the COVID-19, we are under the “stay-at-home” order from the government. People are now working from home, having online lecture, and meeting their friends online; it means all our time is spent at home. By spending almost 24 hours at home, have you ever concerned about the indoor air quality? Air pollution is a serious issue in the society nowadays which will lead to different kinds of illness, and those illnesses might not appear at this moment. Besides, the dusting and vacuuming, it is also important for us to replace the air filter from time to time to improve the air quality. It is a worthy investment to make for you and your family.