城市街谷内PM<sub>2.5</sub>浓度时空变化及影响因素分析

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Abstract In the current work, temporal variations of PM_2.5 concentration, traffic flux, wind speed, air temperature and humidity was measured on Heping Road, which well represents an urban the street canyon, during April 8~10, 2015, in Xi'an. Based on these measurements, diurnal and spatial variations of PM_2.5 in the urban street canyon and the affecting factors were investigated. Generally, PM_2.5 concentrations were found very high in the street canyon, especially in the morning and evening. The lowest PM_2.5 concentrations were observed at 16:00 in the daytime. Good correlations were found between PM_2.5 concentration and air temperature and/or humidity, with R² values of 0.75 and 0.81, respectively. Under weak wind conditions, the temperature variation induced expansion and contraction was found to be the main influencing factor on pollutant dispersion in urban street canyons.

Key words： PM_2.5 concentration street canyon meteorological factors correlation

Received: 12 February 2016

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	Articles by authors
	ZHANG Yun-wei
	WANG Qing-ru
	CHEN Jia
	LIU Sui-xin
	HU Ta-feng
	GU Zhao-lin

Cite this article:

ZHANG Yun-wei,WANG Qing-ru,CHEN Jia等. Temporal and spatial characteristics of PM_2.5 concentration in urban street canyons and analysis on the affecting factors[J]. CHINA ENVIRONMENTAL SCIENCECE, 2016, 36(10): 2944-2949.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2016/V36/I10/2944

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