Air purification systems are devices designed to remove contaminants from the air in a room or building. They work by filtering out pollutants such as dust, pollen, smoke, and pet dander, improving indoor air quality. Common types include HEPA filters, activated carbon filters, and UV light purifiers, each targeting different types of airborne particles. These systems are beneficial for people with allergies, asthma, or other respiratory issues, as they help reduce irritants in the air. Many air purifiers are portable, allowing users to move them between rooms, while others are installed in HVAC systems for whole-house purification.