An indoor air quality monitor is a compact electronic device designed to measure and display the levels of various air pollutants and environmental factors inside a room. It typically tracks elements such as carbon dioxide (CO₂), volatile organic compounds (VOCs), particulate matter (PM2.5 and PM10), temperature, and humidity. The monitor provides real-time readings to help users understand the quality of the air they breathe and take action when levels become unhealthy. Many models connect to mobile apps or smart home systems, offering alerts, detailed reports, and tips to improve indoor air quality for a healthier living environment.