About the World Air Quality Index project

How to use this web application

To get more information about a specific city, move your move over any of the the flags in the above map, then click to get the full air pollution historical data.

		Good			Unhealthy for sensitive groups			Very Unhealthy
		Moderate			Unhealthy			Hazardous

Air Quality Index (AQI) Calculation

The Air Quality Index is based on measurement of particulate matter (PM_2.5 and PM₁₀), Ozone (O₃), Nitrogen Dioxide (NO₂), Sulfur Dioxide (SO₂) and Carbon Monoxide (CO) emissions. Most of the stations on the map are monitoring both PM_2.5 and PM₁₀ data, but there are few exceptions where only PM₁₀ is available.

All measurements are based on hourly readings: For instance, an AQI reported at 8AM means that the measurement was done from 7AM to 8AM.

Further information and links

Want to protect yourself against the air pollution? Check our mask and air purifier page.

Want to know more Air Pollution? Check our Frequently Asked Question (FAQ) page.

Want to see the Air Pollution Forecast? Check our Forecast page.

Want to know more about the project and team? Check the Contact page.

Want to access the Air Quality data via programatic API? Check the API page.

Credits

All the credits must go to the worlwide EPA (Enviromental Protection Agencies), as all this work is only made possible thanks to their work. Check the full worldwide EPA list page.