Air quality information

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 this week

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?

A

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?

A

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

A

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?

A

Written by AirVisual
Updated over a week ago

How are Hanoi’s AQI and the city rankings calculated?

A

Written by AirVisual
Updated over a week ago

How accurate is AirVisual’s data in Vietnam?

A

Written by AirVisual
Updated over a week ago

In Vietnam, where does AirVisual get its data from?

A

Written by AirVisual
Updated over a week ago