The main components of air fresheners are composed of ethanol, flavoring, deionized water, etc., through the distribution of fragrance to cover the odor, itself does not have a certain degree of toxicity, but long-term inhalation or improper use will also cause respiratory discomfort, allergies, as well as dizziness and nausea and other reactions. 1. Respiratory discomfort: air fresheners contain some chemical molecules, which can cause some irritation to the respiratory tract. When inhaled in too high a concentration, it may cause breathing discomfort. 2. Allergy: The ingredients in air fresheners are mixed, which may lead to allergy when used for a long period of time or when used improperly, thus triggering symptoms such as rashes and itchy skin. Especially allergic rhinitis, allergic pharyngitis, allergic asthma and other people should try to avoid using air fresheners. 3. Dizziness and nausea: aromatic compounds containing benzene rings volatilize in the air and can inhibit nerves. If you inhale air fresheners for a long time, you may experience adverse reactions such as dizziness and nausea in the mild case, or in the severe case, it may lead to adverse consequences such as decreased consciousness, convulsions or even coma. When using air fresheners, be sure to use them carefully according to the operating instructions. If any adverse reaction occurs to the human body during use, stop using them immediately and go to a nearby medical institution for medical examination.