Air purifiers are devices designed to improve indoor air quality by removing pollutants and allergens. They work by filtering out particles such as dust, pollen, smoke, and pet dander, making the air cleaner and healthier to breathe. Many air purifiers use HEPA filters, which can capture tiny particles as small as 0.3 microns. In addition to HEPA filters, some air purifiers also use activated carbon filters to eliminate odors and harmful gases. They can be beneficial for people with allergies, asthma, or other respiratory issues. Regular maintenance, such as changing filters, is essential for optimal performance.