Houseplants are good for your health — and not just for their visual beauty. Why? They essentially do the opposite of what we do when we breathe: release oxygen and absorb carbon dioxide. This not only freshens up the air, but also eliminates harmful toxins. Studies have also proven that indoor plants improve concentration and productivity (by up to 15 percent!), reduce stress levels and boost your mood — making them perfect for not just your home but your work space, too.