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Air quality information
Air quality information
Learn about AQI, our data sources, and how we validate and visualize air quality data
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27 articles in this collection
Written by
AirVisual,
Kelsey,
and
Chloe
How can I access historical data on the IQAir platform?
A guide to the freely available historical air quality data provided on the IQAir website and app
Written by
Chloe
Updated over a week ago
Reported AQI levels seem lower than it appears, visually
Reported air quality levels are too low. Published data appears to be incorrect.
Written by
Kelsey
Updated over a week ago
What is AQI?
Guide to understanding the Air Quality Index
Written by
Chloe
Updated over a week ago
What is the difference between the US AQI and WHO air quality guidelines?
Written by
Chloe
Updated over a week ago
What is the difference between China & US AQI; 美国空气质量指数和中国空气质量指数有什么区别?
Written by
Chloe
Updated over a week ago
What is the difference between Singapore’s Pollutant Standards Index and the U.S. Air Quality Index?
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Written by
AirVisual
Updated over a week ago
How is the Malaysian Air Pollution Index calculated?
Learn what is the difference between Malaysia's "API" and other air quality indexes (AQIs)
Written by
Chloe
Updated over a week ago
How is AQI calculated without all 6 key pollutants?
Written by
Chloe
Updated over a week ago
How accurate is AirVisual’s air quality data?
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Written by
AirVisual
Updated over a week ago
How is air quality data validated before publishing on the AirVisual platform?
Written by
Chloe
Updated over a week ago
How can I check the data source of a station?
Learn which different data sources AirVisual uses to report air quality for cities and stations, and how to identify them
Written by
Chloe
Updated over a week ago
What does the asterisk (*) mean on some locations' AQI?
Written by
Chloe
Updated over a week ago
My city's data is unavailable on the AirVisual map
Written by
Chloe
Updated over a week ago
Where does AirVisual get its air quality data from?
Learn which data sources AirVisual reports from to provide global air quality information
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Written by
AirVisual
Updated over a week ago
What determines the major cities ranking?
Written by
Chloe
Updated over a week ago
Air quality forecast
Written by
Chloe
Updated over a week ago
What is AirVisual Earth and how does it work?
Written by
Chloe
Updated over a week ago
What is an air quality widget and how can I use one to display air quality information on my webpage?
Written by
Chloe
Updated over a week ago
How can I access air pollution data through AirVisual's air quality API?
Written by
Chloe
Updated over a week ago
Access AirVisual's AQI, Air quality and pollution API
Written by
Chloe
Updated over a week ago
AirVisual API timestamp - how does it work?
Written by
Chloe
Updated over a week ago
AirVisual’s outdoor data seems to differ from other sources. Why is this?
Written by
Chloe
Updated over a week ago
Why are AirVisual and AirNow showing different AQI numbers?
Written by
Chloe
Updated over a week ago
Why do Vietnamese government stations sometimes disappear from AirVisual’s map?
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Written by
AirVisual
Updated over a week ago
How are Hanoi’s AQI and the city rankings calculated?
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Written by
AirVisual
Updated over a week ago
How accurate is AirVisual’s data in Vietnam?
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Written by
AirVisual
Updated over a week ago
In Vietnam, where does AirVisual get its data from?
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Written by
AirVisual
Updated over a week ago