Your support helps us to tell the story
From reproductive rights to climate change to Big Tech, The Independent is on the ground when the story is developing. Whether it's investigating the financials of Elon Musk's pro-Trump PAC or producing our latest documentary, 'The A Word', which shines a light on the American women fighting for reproductive rights, we know how important it is to parse out the facts from the messaging.
At such a critical moment in US history, we need reporters on the ground. Your donation allows us to keep sending journalists to speak to both sides of the story.
The Independent is trusted by Americans across the entire political spectrum. And unlike many other quality news outlets, we choose not to lock Americans out of our reporting and analysis with paywalls. We believe quality journalism should be available to everyone, paid for by those who can afford it.
Your support makes all the difference.Daily air quality index of some of the world's major cities on January 7, using data from AirNow, CITEAIR, and the American Embassy in Beijing.
| City | Average 06/01/2011 | Average 07/01/2011 |
| London (UK) | Good | Good |
| Madrid (Spain) | Good | NA |
| Paris (France) | Good | Good |
| Brussels (Belgium) | Good | Good |
| Berlin (Germany ) | Good | Good |
| Prague (Czech Republic) | Good | Good |
| Zurich (Switzerland) | Good | Good |
| Beijing (China) | Moderate | NA |
| Beijing - US embassy stats | Good | Unhealthy for sensitive groups |
| Shanghai (China) | Moderate | Moderate |
| Hong Kong (China) | Good | Moderate |
| Brunei (Brunei) | Good | Good |
| New York (USA) | Moderate | Moderate |
| San Francisco (USA) | Moderate | Moderate |
| Mexico City (Mexico ) | Unhealthy for sensitive groups | Unhealthy for sensitive groups |
| Montreal (Canada) | Good | Good |
| Toronto (Canada) | Good | Good |
| New Delhi (India) | Unhealthy for sensitive groups | 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 9:00am GMT on January 7.
http://www.airqualitynow.eu
http://www.airnow.gov
Join our commenting forum
Join thought-provoking conversations, follow other Independent readers and see their replies
Comments