Beijing air pollution study could unlock solution to persistent smog

Particle pollution in China’s capital has fallen by 60% in 10 years, but it remains six times higher than WHO guidelinesPhotographs of smog enveloping Beijing’s Bird’s Nest stadium became one of the defining images of the first decade of this century. China’s annual air pollution deaths reached 2.6 million people a year in 2005. At the time, Beijing was crowned smog capital of the world and concerns for the health of athletes overshadowed preparations for the 2008 Olympic