Purifier, an air conditioner for bath and toilet, detects the smell, temperature, humidity, and user's activity via electronic nose, temperature, humidity, and infrared sensor. Equipped with AI data analysis for air convection, purification and deodorization, it adjusts the temperature and humidity for different users and releases the fragrance. It utilizes the water of self-dehumidification to go through electrolysis and produce bactericidal liquid to eliminate the cause of odor; plants and photocatalyst systems on it can clear the odor. Purifier brings greenness to the bathroom and creates comfortable and healthy experience.