The air you breathe inside your car is filtered through the cabin air filter. Located behind the glovebox of most cars, it must be changed periodically. Your owner’s manual will advise the bare minimum frequency recommended for your vehicle, but some car owners opt to change there’s more frequently. Environmental impacts, including fires, can impact how quickly the cabin air filter fills up, and could cause it to require replacement more often. Luckily, it’s a relatively easy replacement that most people can do themselves, with ease. This guide will offer a breakdown of the general technique, but I recommend looking up a vehicle-specific tutorial as well to make sure your car doesn’t have any particular quirks.