Air Quality Indices (AQI) are numerical scales used to communicate the quality of air in a specific area. They measure the concentration of pollutants, such as particulate matter, ozone, and nitrogen dioxide, and convert these measurements into a single value. The AQI helps people understand how polluted the air is and what associated health effects might be of concern. The AQI typically ranges from 0 to 500, with lower values indicating good air quality and higher values indicating worse conditions. Different color codes are used to represent various levels of health concern, making it easier for the public to interpret the data quickly and take necessary precautions.