As a suggestion, it would be great if purifiers could monitor and graph CO2 levels in ppm in the home. CO2 levels are a great way to monitor how stale the air in the house is. The purifier may not be able to reduce CO2 in the home but by helping users monitor it, people can proactively know when to increase ventilation in the home.
CO2 monitoring is a requirement in many commercial scenarios and businesses for their staff and customers and it would be great to be able to bring this to the home in a simple and easy way.