About the World Air Quality Index project

How to use this web application

Good Unhealthy for sensitive groups Very Unhealthy Moderate Unhealthy Hazardous

Air Quality Index (AQI) Calculation

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Further information and links

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.The Air Quality Index is based on measurement of particulate matter (PMand PM), Ozone (O), Nitrogen Dioxide (NO), Sulfur Dioxide (SO) and Carbon Monoxide (CO) emissions. Most of the stations on the map are monitoring both PMand PMdata, but there are few exceptions where only PMis 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.