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News & Advice

Index of air quality in the world's major cities: February 21

Daily air quality index of some of the world's major cities on February 21, using data from AirNow, CITEAIR, and the American Embassy in Beijing.


Average Friday 18/02/2011                                                   Average Monday 21/02/2011                                                    

London (UK)

Madrid (Spain) NA NA

Paris (France)

Brussels (Belgium)  

Berlin (Germany )

Prague (Czech Republic)

Zurich (Switzerland)

Beijing (China) NA
Beijing US embassy stats

Shanghai (China)  


Hong Kong (China)

Brunei (Brunei)
Seoul (South Korea) NA

New York (USA)  

San Francisco (USA)

Mexico City (Mexico )

Montreal (Canada)

Toronto (Canada)

New Delhi (India)

Sydney (Australia)

The Air Quality Index (AQI) or Air Pollution Index (API) measures the parts of pollutant in a specified volume of air. The lower the AQI the fewer particles of pollution are in the air. For a more detailed explanation see http://www.airnow.gov/index.cfm?action=aqibasics.aqi.

All results are color-coded following the American AQI standard shown below. For all countries outside of Europe, the US and Canada, that region's definition of AQI terms has been accepted.


Air Quality






Unhealthy for sensitive groups




Very Unhealthy




Data: Data relating to Europe, the US and Canada is taken from CITEAIR - Common Information to European Air ( http://www.airnow.gov / http://www.airqualitynow.eu); data concerning China is taken from both official Chinese government sources and the US Embassy's automated air index Twitter account. For all countries the data displayed falls within either that country's definition of the level of air quality or the international AQI index. Data for all European, US and Canadian cities refers to background, not roadside, levels of air quality.

All data was collected at 8:00am GMT on February 21.