Air quality monitors are devices that measure the levels of pollutants in the air, such as carbon dioxide, particulate matter, and volatile organic compounds. They help individuals and communities understand the quality of the air they breathe, providing real-time data that can inform health decisions and environmental policies. These monitors can be found in various forms, from portable handheld devices to fixed installations in urban areas. Many modern air quality monitors connect to smartphones or computers, allowing users to track air quality trends over time and receive alerts when pollution levels become hazardous.