Air quality in the cabin of your vehicle is important. For your health, for your family's health, and the health of your car as well. The cabin air filter is what makes sure that the air inside your vehicle is clean, and it does this by filtering out particles, allergens, and more, so the air you breathe is free of unwanted microbes and dust. But, this air filter gets clogged over time, and you need to get it replaced once it's no longer able to filter out unwanted particles.