I recently came across a list of the best air-filtering houseplants compiled primarily by NASA while researching the use of plants to clean air and provide oxygen on space stations. It inspired me to purchase a peace lily for my home office. From here, I’ll work my way up to the 15 – 18 good-sized house plants that NASA recommends you use to help keep the air in your house clean. I have no idea if they will really make a difference, or even if the air in my house contains the kinds of impurities that these plants excel at removing, but I figure they can’t hurt.