Blueair Blue 3610 Air Purifier Replacement FilterThe particle filter layer minimises the airborne particles that can trigger allergy symptoms, including pollen, dust, mould spores, pet dander, viruses, bacteria, and fine smoke particles. The layer of activated coconut carbon absorbs light gases, including volatile organic compounds (VOC), smog, chemicals, and unwanted household odours from pets, smoke, and cooking. You should replace the combination filter every 6 months (4,380 hours) when used 24