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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.
- Fire and Smoke Map
About the Data. The Fire and Smoke Map shows information on...
- AQI Basics
What is the U.S. Air Quality Index (AQI)? The U.S. AQI is...
- National Maps
National Maps displaying Current Air Quality, Today's Air...
- Smoke Advisories
Smoke Advisories - Air Quality Index (AQI) | AirNow.gov
- AQI & Health
Local air quality can affect our daily lives. Like the...
- System Alerts
System Alerts - Air Quality Index (AQI) | AirNow.gov
- Concentration to AQI
Concentration to AQI - Air Quality Index (AQI) | AirNow.gov
- What is The AQI
The EPA and your State environmental agency measure...
- Fire and Smoke Map
- Air Pollutants Measured in AQI
- AQI Categories
- Differences Between AQI Systems
- The Takeaway
There are six air pollutants measured in the index formula, including: 1. PM2.5 2. PM10 3. carbon monoxide 4. sulfur dioxide 5. nitrogen dioxide 6. ground-level ozone An AQI number is assigned based on the air pollutant with the highest AQI number at the moment the air quality is measured. Only pollutants available from a given air quality monitori...
Here’s how each of the AQI categories are represented, how they can impact human health, and some recommendations for what to do when the AQI has reached a higher category. The categories are listed from least harmful to human health (“good”) to the most harmful (“hazardous”).
There are different systems used around the world for measuring air quality. The United States and China AQI systems are the most widely used systems – both measure the same group of air pollutants. However, each system rates AQI scores from 200 and lower differently.2 The U.S. AQI system generally yields higher scores for AQI under 200 because low...
The air quality index reinterprets potentially complex air quality data into a meaningful number with corresponding categories of pollutant concentrations and associated health effects. Please note, though, that there is no safe level of air pollution, in particular as the AQI reaches closer to 50 and beyond. By knowing whether the air we breathe i...
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.
Daily Aqi ColorLevels Of ConcernValues Of IndexDescription Of Air QualityGreenGood0 to 50Air quality is satisfactory, and air ...YellowModerate51 to 100Air quality is acceptable. However, there ...OrangeUnhealthy for Sensitive Groups101 to 150Members of sensitive groups may ...RedUnhealthy151 to 200Some members of the general public may ...The CAQI is a number on a scale from 0 to 100, where a low value means good air quality and a high value means poor air quality. The index is defined in both hourly and daily versions, and separately near roads (a "roadside" or "traffic" index) or away from roads (a "background" index).
The EPA and your State environmental agency measure pollution in the air. Then they use the Air Quality Index, or AQI, to tell the people about the air. An index can be a quick way to tell people how good or bad something is.
Dec 8, 2023 · Daily air quality is displayed in terms of the Air Quality Index (AQI) for the criteria pollutants, or in concentration ranges for certain PM species like organic carbon, nitrates, and sulfates. This tool may be useful for tracking an air pollution episode like a wildfire event.
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Sep 27, 2023 · The AQI is a scale that provides real-time information on the amount of pollution in the air. The U.S. Environmental Protection Agency (EPA) developed the index as a way of reporting air...
