Index of air quality in the world's major cities: January 19

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The Independent Travel

Daily air quality index of some of the world's major cities on January 19, using data from AirNow, CITEAIR, and the American Embassy in Beijing.


Average 18/01/2011                                                         
Average 19/01/2011

London (UK)

Good Good                                                              
Madrid (Spain) Moderate NA

Paris (France)

Good Good

Brussels (Belgium)  

Good Good

Berlin (Germany )

Good Good

Prague (Czech Republic)

Good NA

Zurich (Switzerland)

Good Good

Beijing (China)  

Good Good

Beijing - US embassy stats

Moderate Good

Shanghai (China)  

Good Good

Hong Kong (China)

Good Moderate

Brunei (Brunei)

Good Good
Seoul (South Korea) NA Moderate

New York (USA)  

Moderate Moderate

San Francisco (USA)

Moderate Moderate

Mexico City (Mexico )

Moderate Unhealthy for sensitive groups

Montreal (Canada)

Good Moderate

Toronto (Canada)

Good Good

New Delhi (India)

Unhealthy Unhealthy

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

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 January 19.