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  1. www.airnow.gov › aqi › aqi-basicsAir Quality Index (AQI) Basics - AirNow

    What is the U.S. Air Quality Index (AQI)? The U.S. AQI is EPA’s index for reporting air quality. How does the AQI work? Think of the AQI as a yardstick that runs from 0 to 500. The higher the AQI value, the greater the level of air pollution and the greater the health concern.

    • Fire & Smoke Map

      About the Data. The Fire and Smoke Map shows information on...

    • AQI & Health

      Air Quality Index (AQI) & Health. Millions of people live in...

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      Wildfire smoke continues to impact air quality in multiple...

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  3. en.wikipedia.org › wiki › Air_quality_indexAir quality index - Wikipedia

    An air quality index (AQI) is an indicator developed by government agencies [1] to communicate to the public how polluted the air currently is or how polluted it is forecast to become. [2][3] As air pollution levels rise, so does the AQI, along with the associated public health risk.

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  5. www.iqair.com › newsroom › what-is-aqiWhat is the air quality index (AQI)? | IQAir

    Aug 4, 2018 · The Air Quality Index (AQI) is a measurement of air pollutant concentrations in ambient air pollution and their associated health risks. Air pollutants measured in AQI. There are six air pollutants measured in the index formula, including: PM2.5; PM10; carbon monoxide; sulfur dioxide; nitrogen dioxide; ground-level ozone

  6. www.airnow.gov › aqiAir Quality Index (AQI) | AirNow.gov

    The Air Quality Index (AQI) tells you how clean or polluted your outdoor air is and the associated health effects that may be of concern.

  7. www.nytimes.com › article › air-quality-indexWhat is the Air Quality Index? Here's How to Stay Safe - The ...

    Jun 5, 2024 · The Air Quality Index measures the density of five pollutants in the air: ground-level ozone, particulates, carbon monoxide, nitrogen dioxide, and sulfur dioxide. It was...

  8. www.weather.gov › safety › airquality-aqindexAir 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. The AQI focuses on health effects you may experience within a few hours or days after breathing polluted air.

  9. www.airnow.gov › using-air-quality-indexUsing Air Quality Index | AirNow.gov

    What it is: The U.S. Air Quality Index, or AQI, is EPA’s tool for communicating daily air quality. It uses color-coded categories and provides statements for each category that tell you about air quality in your area, which groups of people may be affected, and steps you can take to reduce your exposure to air pollution.

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