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作者

来源

CITIES,Vol.89,P.130-140

语言

英文

关键字

Air quality; Urban form; Spatial autoregressive model; Prefecture-level cities in China; POLLUTION; EMISSIONS; POLLUTANTS; IMPACTS; CLIMATE

作者单位

[Li, Fan; Zhou, Tao] Chongqing Univ, Sch Construct Management & Real Estate, Chongqing 400044, Peoples R China. [Zhou, Tao] Chongqing Univ, Res Ctr Construct Econ & Management, Chongqing 400044, Peoples R China. Zhou, T (reprint author), Chongqing Univ, Sch Construct Management & Real Estate, Chongqing 400044, Peoples R China. E-Mail: fanli@cqu.edu.cn; taozhou@cqu.edu.cn

标签

城市环境,城市形态 |

摘要

Understanding how urban air quality depends on urban form can have important implications for improving urban air quality by optimizing urban planning and management policies. This study employed the spatial autoregressive model to explore the effect of urban form on urban air quality in 288 prefecture-level cities in China. Information on the air quality (AQI) and six criteria pollutants (PM2.5, PM10, CO, SO2, NO2, O-3) were obtained from the hourly observation data of 1333 in-situ air monitoring stations throughout 2015. Urban form is characterized by five metrics, including urban size, shape, sprawl, fragmentation and traffic accessibility, and it is calculated based on land cover data. Results show that urban shape complexity and population density have a significant negative impact on urban air quality. Large city size is strongly related to comparatively poor air quality for cities in Southern China and only shows a slight association with emissions in Northern China. In general, lower-sized, scattered, polycentric cities provide better air quality in China. It is suggested that higher air quality and fewer pollutant emissions can be achieved through urban form planning and management policies, which aim to restrict the blind expansion of urban land and encourage moderately scattered, polycentric urban development.