Title: Spatial and diurnal variations in concentration of atmospheric NO_x along urban-rural roadways in Nanjing, Southeastern China

Authors: Yunlong Yin, Taolin Zhang, Yongming Luo, Donghui Lu

Addresses: Institute of Botany, Jiangsu Province and the Chinese Academy of Sciences, Nanjing 210014, PR China. ' Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, PR China. ' Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, PR China. ' Institute of Botany, Jiangsu Province and the Chinese Academy of Sciences, Nanjing 210014, PR China

Abstract: Atmospheric NO_x concentrations (including NO₂ and NO) on the roadside environments of urban trunk, belt highway and suburban road as well as a reference in a forest area were measured. NO_x concentrations on roadside environments tended to be higher than that on the reference. With the exception of suburban road, NO_x concentrations over both of the urban trunk and belt highway exceeded the limited value of National Air Environmental Quality Standards. Gradient measurement of NO_x on the downwind side of the belt highway shows that it declined to background level over 100 m from the road edge.

Keywords: air pollution; nitrogen oxide; traffic volume; urban-rural roadways; Southeastern China; urban trunk roads; belt highways; suburban roads; forest areas; air quality.

DOI: 10.1504/IJEP.2008.017915

International Journal of Environment and Pollution, 2008 Vol.32 No.3, pp.332 - 340

Published online: 23 Apr 2008 *

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