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.
| City | 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.
Legend
| Air Quality |
|
| Good |
|
| Moderate |
|
| Unhealthy for sensitive groups |
|
| Unhealthy |
|
| Very Unhealthy |
|
| Hazardous |
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.
http://www.airqualitynow.eu
http://www.airnow.gov
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