The Air Quality Index (AQI) is a numerical scale used to communicate the quality of air in a specific area. It measures the concentration of pollutants, such as particulate matter, ozone, and nitrogen dioxide, and translates these levels into a simple number ranging from 0 to 500. Lower values indicate good air quality, while higher values signal increasing levels of pollution and potential health risks. The AQI is divided into categories that represent different levels of health concern. For example, an AQI value of 0-50 is considered "Good," while values above 300 fall into the "Hazardous" category. This system helps individuals understand the air quality and take necessary precautions, especially those with respiratory conditions.