The short answer is that they last for two to four months, but this can vary depending on the type of car freshener you use and the scent. Natural fragrance ingredients tend to dissipate more quickly than synthetic ones, and the longevity of a particular air freshener may also depend on its location and environmental conditions.

For example, a hanging cardboard air freshener will last much longer if it is kept out of direct sunlight and in a cool, dry place since heat and light can cause the fragrance to degrade more quickly. Similarly, a vent clip air freshener that is clipped to the vent of your vehicle will work best when it is located away from direct sunlight and out of the heat.

A popular air freshener option is the Little Trees car freshener, which has a classic evergreen tree shape and comes in a variety of scents. While these air fresheners typically last for about three months when hung in your vehicle, you can prolong their lifespan by following some simple tips.

Generally, hanging cardboard air fresheners last about two to four weeks and can be replaced easily when the scent starts to fade. Vent clip and gel air fresheners, on the other hand, usually last between 30 to 60 days before they start to lose their scent.

If you want a scent that lasts even longer, try one of the Yankee Candle vent clips with a Midsummer’s Night fragrance. This car freshener can last for up to 90 days when used regularly and features an adjustable lid and silde bar so you can set the intensity of the fragrance to your liking.