As it gears up to host the 2008 Olympic Games Beijing has been awarded an unwelcome new accolade: the air pollution capital of the world.
Satellite data has revealed that the city is one of the worst environmental victims of China's spectacular economic growth, which has brought with it air pollution levels that are blamed for more than 400,000 premature deaths a year.
According to the European Space Agency, Beijing and its neighboring northeast Chinese provinces have the planet's worst levels of nitrogen dioxide, which can cause fatal damage to the lungs.
China is the world's second-largest producer of greenhouse gases, and the World Bank has warned it is home to 16 of the planet's 20 most air-polluted cities.