Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/61219
Title: Top-down estimates of benzene and toluene emissions in the Pearl River Delta and Hong Kong, China
Authors: Fang, X
Shao, M
Stohl, A
Zhang, Q
Zheng, J
Guo, H 
Wang, C
Wang, M
Ou, J
Thompson, RL
Prinn, RG
Issue Date: 2016
Publisher: Copernicus GmbH
Source: Atmospheric chemistry and physics, 2016, v. 16, no. 5, p. 3369-3382 How to cite?
Journal: Atmospheric chemistry and physics 
Abstract: Benzene (C6H6) and toluene (C7H8) are toxic to humans and the environment. They are also important precursors of ground-level ozone and secondary organic aerosols and contribute substantially to severe air pollution in urban areas in China. Discrepancies exist between different bottom-up inventories for benzene and toluene emissions in the Pearl River Delta (PRD) and Hong Kong (HK), which are emission hot spots in China. This study provides top-down estimates of benzene and toluene emissions in the PRD and HK using atmospheric measurement data from a rural site in the area, Heshan, an atmospheric transport model, and an inverse modeling method. The model simulations captured the measured mixing ratios during most pollution episodes. For the PRD and HK, the benzene emissions estimated in this study for 2010 were 44 (12-75) and 5 (2-7) Gg yr-1 for the PRD and HK, respectively, and the toluene emissions were 131 (44-218) and 6 (2-9) Gg yr-1, respectively. Temporal and spatial differences between the inversion estimate and four different bottom-up emission estimates are discussed, and it is proposed that more observations at different sites are urgently needed to better constrain benzene and toluene (and other air pollutant) emissions in the PRD and HK in the future.
URI: http://hdl.handle.net/10397/61219
ISSN: 1680-7316
EISSN: 1680-7324
DOI: 10.5194/acp-16-3369-2016
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