Beijing hit by thick smog as it struggles to improve air quality for ‘green’ Winter Olympics | South China Morning Post

Ahead of the Beijing Winter Olympics, the Chinese capital has been enveloped in thick smog. Concentrations of the hazardous airborne particle PM2.5 were measured at 205 micrograms per cubic metre on January 24. This exceeds the recommended levels of no more than 5 by the World Health Organization. But Beijing and it…

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