Index of air quality in the world's major cities: December 31

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The Independent Travel

Daily air quality index of some of the world's major cities on December 31, using data from AirNow, CITEAIR, and the American Embassy in Beijing.


Average 30/12/2010 Average 31/12/2010

London (UK)

Good Good
Madrid (Spain) Good                                                              NA                                                   

Paris (France)

Good Good

Brussels (Belgium)  

Good Good

Berlin (Germany )


Prague (Czech Republic)

Moderate Moderate

Zurich (Switzerland)

Good Moderate

Beijing (China)  


Beijing - US embassy stats

Good Moderate

Shanghai (China)  

Unhealthy for sensitive groups Unhealthy for sensitive groups

Hong Kong (China)

Moderate Moderate

Brunei (Brunei)

Good Good

New York (USA)  

Moderate Unhealthy for sensitive groups

San Francisco (USA)

Good Moderate

Mexico City (Mexico )

Unhealthy for sensitive groups Unhealthy for sensitive groups

Montreal (Canada)

Good NA

Toronto (Canada)

Good Good

New Delhi (India)

NA Unhealthy

Sydney (Australia)

NA 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

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 ( /; 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 9:00am GMT on December 31.