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Atmosphere 2018, 9(4), 157;

PM2.5 Characteristics and Regional Transport Contribution in Five Cities in Southern North China Plain, During 2013–2015

State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China
University of Chinese Academy of Sciences, Beijing 100049, China
Laboratory of Critical Zone Evolution, School of Earth Sciences, China University of Geosciences, Wuhan 430074, China
Department of Chemistry, Analytical and Testing Center, Capital Normal University, Beijing 100048, China
Hebei Province Meteorological Observatory, Shijiazhuang 050022, China
Author to whom correspondence should be addressed.
Received: 4 March 2018 / Revised: 3 April 2018 / Accepted: 12 April 2018 / Published: 21 April 2018
(This article belongs to the Special Issue Air Quality in China: Past, Present and Future)
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PM2.5 data from major cities in the southern North China Plain during 2013–2015 were comprehensively analyzed relative to variation features, meteorology effects, and regional transport contributions. The annual average ranged from 87 to 123 μg m−3, with the highest in Baoding and Shijiazhuang, the moderate in Handan and Hengshui, and the lowest in Cangzhou, which revealed an evident concentration gradient with distance from the mountains. PM2.5 pollution indicated significantly regional characteristics and high correlations in daily PM2.5 changes and similar seasonal and diurnal variations in five cities. The highest concentrations mainly occurred in the winter, then autumn, spring, and summer, and the diurnal variations were bimodal with peaks during the morning rush hours and at night, which were mostly dominated by the differences in source emissions and the boundary layer. The PM2.5 concentrations were significantly positively correlated with relative humidity, especially during winter. The highest PM2.5 concentrations in all cities were associated with the south, southeast, and southwest pathways, while the short northwest pathway in the winter for Baoding and Shijiazhuang experienced the highest concentration. Regional contributions ranged from 19.6 to 33.7% annually, with the largest in Baoding and Shijiazhuang. These results provide a scientific basis for pollution forecasting and control in these heavily polluted cities. View Full-Text
Keywords: PM2.5; seasonal and diurnal variation; meteorology; regional transport; southern Hebei PM2.5; seasonal and diurnal variation; meteorology; regional transport; southern Hebei

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Wang, L.; Li, W.; Sun, Y.; Tao, M.; Xin, J.; Song, T.; Li, X.; Zhang, N.; Ying, K.; Wang, Y. PM2.5 Characteristics and Regional Transport Contribution in Five Cities in Southern North China Plain, During 2013–2015. Atmosphere 2018, 9, 157.

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