Many pedestrians wore face masks during the smog of January 2013
Over recent years China’s capital city, Beijing, has been suffering from increasing levels of air pollution. There is an almost permanent charcoal grey haze in the air, creating a major health hazard for the city’s 20 million inhabitants. Beijing is inland and surrounded by mountains (Figure 1), so pollution tends to accumulate.
In early 2013 the air was particularly bad, with a choking grey smog clamped over the city for days on end. At its worst, pollution levels were 30 times higher than those deemed safe by the World Health Organization (WHO).
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