People spend as much as 90% of their lives indoors. U.S. Environmental Protection Agency statistics show that indoor air quality is five times worse than outdoor air, making it one of the top threats to good health. It's linked to allergies, sickness and fatigue. Fortunately, indoor air quality can be improved with the help of home air filters, purifiers and living house plants. Plants cycle the air by taking in carbon dioxide and releasing oxygen. But plants also have the ability to purify