It's a well-known fact that houseplants are some of the best things to keep inside your home to purify the air. But having houseplants in every room of the house can be a little too much. Here's the good news: According to NASA, indoor plants absorb pollutants through their leaves and roots and make fresh air from it. In just 24 hours, they can remove 87 percent of the toxins in a room. So by moving houseplants room-to-room day by day, you can help purify the air throughout the whole house. Be sure they are placed in a sunny spot so they can thrive as you move them.