While Hepa air filters are still one of the most effective ways to purify your indoor air, there is also a cheaper (and prettier!) way to clean your air. Plants!
A study published by the National Aeronautics and Space Administration (NASA), with help from the Associated Landscape Contractors of America (ALCA) suggesting certain plants could be used to rid indoor spaces of harmful toxins (VOCs) commonly found in homes (formaldehyde, benzene, trichloroethylene and amonia, among others). In the study, researchers recommend one plant per 100 square feet for optimal resuts.
Here are a few to try:
Golden Pothos (Devil's Ivy)
Chinese Evergreen (Aglaonema Crispum 'Deborah')