Car fresheners are designed to improve the scent and overall freshness of the air in a vehicle. However, car diffusers or car air purifiers that use essential oils as fragrances have become popular with many drivers in recent years. These devices release a pleasant aroma that can help to cover up unpleasant smells from pets, cigarette smoke, or other sources. Moreover, some scents are believed to have calming effects, which may make driving more enjoyable and less stressful. Therefore, car diffusers or car air purifiers can not only provide an elevated driving experience but also promote a more relaxing and pleasant atmosphere within the car.