Air purifiers are useful for rhinitis patients to improve their symptoms. Air purifiers can adsorb and filter various dusts, mites and chemical and irritating substances in the air, improve ambient air quality and regulate air humidity, which is beneficial for rhinitis patients, especially allergic rhinitis patients, to reduce or alleviate the irritating effect on the nasal mucosa and improve the inflammatory or allergic state of the nasal mucosa, thus avoiding the occurrence and development of rhinitis-related symptoms. Especially in the more serious air pollution areas or indoor decoration, indoor air residual formaldehyde and other polluting smell of the situation, the improvement effect will be more obvious.