... compounds inside the car , such as formaldehyde, ammonia, benzene, TVOCTotal volatile organic compounds, etc., deodorize unpleasant smells of cigarette smoke, alcohol ... and static electricity in air, purify polluted substance from car off gas, such as carbon monoxide, ex nitride ox ... aromatics or perfume oil, and to make fragrance in car, produce the romance6. Prevent diseasesThe ions can improve the ...