The Air Quality Index (AQI) is a standardized system used to measure and report air pollution levels in an easily understandable format. It provides a numerical scale that indicates the cleanliness or pollution level of the air, along with associated health advisories. Monitor your location's AQI in real-time. Get the latest air quality index and pollution levels, updated frequently for accurate, actionable information. What Is AQI? AQI or Air Quality Index is like a report card for the air around you.It gives you a single number (usually between 0 and 500) that tells you how clean or polluted the air is and what that means for your health. The Air Quality Index (AQI) is a scale used to measure and communicate how polluted the air is or is expected to become. It provides insights into the levels of key pollutants in the air, such as particulate matter (PM10 and PM2.5), nitrogen dioxide, sulphur dioxide, carbon monoxide, and ozone.