Indoor pollution is one of the most dangerous problems we are facing in the world today. Since it cannot be seen with the naked eye, the majority of people remain uninformed about this ongoing problem, and no action is taken to prevent it. In terms of design, the concept of this book is based on the fact that you cannot see this problem, but it is right in front of you. The typeface used is Avenir to send out an alert. Throughout the whole book, the type and graphics will take up more and more space to simulate the pollution that is building up quietly inside the home. So be alert or your love ones will be next!