Houseplants are sensitive to the space in which they live. They absorb carbon dioxide, heavy metals from the air (but here, you need to check the specific type, some do it more and some less). Some species of plants emit essential oils and fill the space with their aroma. It would help if several plants were in the room for a tangible result. Oh, by the way, if you humidify the air for your pots, you are doing yourself a favor - dry air is also harmful to human health.