People commonly believe that outdoor air pollution is the only concern, while indoor air is safe. However, recent scientific research suggests otherwise. A study in the journal ‘Science of the Total Environment’ revealed that indoor air can be more harmful than outdoor air. Furthermore, the United States Environmental Protection Agency (EPA) states that indoor air pollution levels can be two to five times higher than outdoor air. Defining Indoor Air Pollution Indoor air pollution refers to the physical, chemical, and biological contamination of the air within buildings, workplaces, industrial and...