2015~2018年中国代表性城市PM<sub>2.5</sub>浓度的城乡差异

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Abstract Observation sites in the 11 representative cities from 6 main city clusters in China were selected in this study. These observation sites were categorized into urban, suburban and rural to investigate urban-rural differences in PM_2.5 concentrations. Results showed that the diurnal variation patterns of PM_2.5 were relatively similar in the cities from the same city cluster, and they were also similar among the urban, suburban and rural areas in a specific city. In Jingjinji Megalopolis and Yangtze River Delta Megalopolis, the PM_2.5 concentrations from the urban sites were the highest, 7.8%~9.7% higher than those from the suburban sites and 11.3%~16.9% higher than those from the rural sites. However, in Guangdong-Hong Kong-Macao Greater Bay Area and the inland city clusters (i.e., Chengyu Megalopolis, Middle Yangtze River Valley Megalopolis and Guanzhong Plain Megalopolis), the PM_2.5 concentrations from the suburban sites were the highest, 2.6%~11.2% higher than those from the urban sites and 16.7%~26.5% higher than those from the rural sites. Moreover, different diurnal variation patterns of urban-rural PM_2.5 concentration differences were observed in different cities. For example, the diurnal variation of urban-rural PM_2.5 concentration difference was unimodal in Shanghai but bimodal in Hangzhou. The maximum of urban-rural PM_2.5 concentration difference occurred during the daytime in Guangzhou but during the nighttime in Shenzhen. Further, the PM_2.5 concentration distribution in the urban, suburban and rural areas of the 11representative cities were under the combined effects of PM_2.5 emission, transportation and diffusion.

Key words： PM_2.5 city clusters urban-rural PM_2.5 concentration difference emission transport and diffusion

Received: 29 April 2019

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X513

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	Articles by authors
	JIANG Yun-cong
	YANG Yuan-jian
	WANG Hong
	LI Yu-bin
	GAO Zhi-qiu
	ZHAO Chun

Cite this article:

JIANG Yun-cong,YANG Yuan-jian,WANG Hong等. Urban-rural differences in PM_2.5 concentrations in the representative cities of China during 2015~2018[J]. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(11): 4552-4560.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2019/V39/I11/4552

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