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Index of air quality in the world's major cities

Daily air quality index of some of the world's major cities on December 7, using data from AirNow, CITEAIR, and the American Embassy in Beijing.


Average 06/12/2010 Average 07/12/2010

London (UK)

Good Good

Madrid (Spain)

  Moderate                                               NA

Paris (France)

Good Good

Brussels (Belgium)  

Good Moderate                                                             

Berlin (Germany )

Good Good

Prague (Czech Republic)

Moderate Moderate

Zurich (Switzerland)

Good Good

Beijing (China)  

Unhealthy for sensitive groups Unhealthy for sensitive groups

Beijing - US embassy stats

Moderate Unhealthy for sensitive groups

Shanghai (China)  

Unhealthy for sensitive groups Moderate

Hong Kong (China)

Moderate Moderate

Brunei (Brunei)

Good NA

New York (USA)  

Good Good

San Francisco (USA)

Good Good

Mexico City (Mexico )

Moderate Moderate

Montreal (Canada)

Good Good

Toronto (Canada)

Good Good

New Delhi (India)

Hazardous Unhealthy for sensitive groups

Sydney (Australia)

Good Good

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 1:00pm GMT on December 7.