The university's figures sparked controversy in India after the data was interpreted as meaning Delhi's air quality was worse than that of Beijing. The government of Delhi and the ministry of earth sciences both denied this, but the Times of India said the latest WHO figures show that Beijing has better systems in place to deal with air pollution.

The newspaper quoted Dr Maria Neira, WHO director for Public Health, Environmental and Social Determinants of Health, as saying, "Cities such as Copenhagen and Bogota have improved air quality by promoting 'active transport' and prioritizing dedicated networks of urban public transport, walking and cycling."

About the broadcaster:

Lance Crayon is a videographer and editor with China Daily. Since living in Beijing he has worked for China Radio International (CRI) and Global Times. Before moving to China he worked in the film industry in Los Angeles as a talent agent and producer. He has a B.A. in English from the University of Texas at Arlington.

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