Rapid growth and greatly expanded motor vehicle ownership and usage have contributed to serious air pollution across China. In 2014 alone, Beijing endured more than twenty days with almost ten times the national ambient air quality limit, causing public health issues. Can better urban form reduce air pollution?
In collaboration with four UNC Program on Chinese Cities (PCC) visiting scholars, Director of the PCC and CURS Faculty Fellow Yan Song recently published a paper in the Journal of Planning Education and Research evaluating this question.
Based on evidence gathered from 157 Chinese cities, this study analyzed the effects of aspects of urban form metrics on concentrations of ambient pollutants. Greater population density, more centralized development and better street accessibility were found to have a significant correlation with lower concentrations of air pollutants, while a higher level of urban sprawl may have a negative impact on air quality.
“The influence of urban form on pollution,” said Song, “is comparable to the effects of other factors like weather conditions.” Cities with urban sprawl are more likely to contain higher levels of air pollution, which should draw wide attention from local governments and planners in China. “These findings indicate that urban form could play a modest, but important, role in improving air quality for Chinese cities,” noted Song.
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