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  1. Air Quality Index (AQI) Basics - AirNow.gov

    The U.S. Air Quality Index (AQI) is EPA's tool for communicating about outdoor air quality and health. The AQI includes six color-coded categories, each corresponding to a range of index …

  2. Air Quality Index - American Lung Association

    Sep 18, 2024 · What Is the Air Quality Index? Ever hear your local weather forecast say that tomorrow will be a "code orange" day for air pollution? That's the Air Quality Index at work. …

  3. Air quality index - Wikipedia

    The air quality index (AQI) for an individual location is simply the highest of the air quality index values for each pollutant being monitored at that location.

  4. Air Quality Index - National Weather Service

    The Air Quality Index (AQI) is used for reporting daily air quality. It tells you how clean or polluted your air is, and what associated health effects might be a concern for you.

  5. What is the air quality index (AQI)? | Knowledge Base | IQAir

    It simplifies complex air pollution data into a single value that indicates how clean or polluted the air is and what associated health effects might be a concern. The AQI scale ranges from 0 to …

  6. Air Quality Index Explained: What You Need to Know - Air ...

    Nov 20, 2025 · The Air Quality Index (AQI) is a standardized system for reporting the level of air pollutants in the atmosphere. It helps you understand at a glance whether the air around you is …

  7. Air quality index (AQI) | Description, EPA, Pollution, Smog ...

    Jan 5, 2026 · air quality index (AQI), an online, color-coded index created by the U.S. Environmental Protection Agency (EPA) that communicates whether the relative air quality …

  8. Air Quality Index (AQI) Explained: What Those Numbers Mean ...

    Mar 7, 2025 · In this guide, we’ll break down what the Air Quality Index means, how it’s calculated, and what those numbers signal for your daily life. Let’s dive in! What Is the Air …

  9. About Air Quality | Air Quality | CDC

    May 14, 2024 · Pay attention to the Air Quality Index (AQI). The AQI tells you when high levels of air pollution are predicted and how air pollution affects your health. Finding the AQI is easy. It's …

  10. What is an air quality index? – The Institute for ...

    Jun 17, 2025 · What is an Air Quality Index? An Air Quality Index (AQI) is a single, standardized number used by government agencies to communicate to the public how polluted the air …