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Title: PAN-precursor relationship and process analysis of PAN variations in the Pearl River Delta Region
Authors: Yuan, J
Ling, ZH
Wang, Z 
Lu, X
Fan, SJ
He, ZR
Guo, H 
Wang, XM
Wang, N
Keywords: Peroxy acetyl nitrate
Process analysis
Pearl river delta
Issue Date: 2018
Publisher: Molecular Diversity Preservation International (MDPI)
Source: Atmosphere, Oct. 2018, v. 9, no. 10, 372, p. 1-16 How to cite?
Journal: Atmosphere 
Abstract: Peroxy acetyl nitrate (PAN) is an important photochemical product formed from the reactions between volatile organic compounds (VOCs) and nitrogen oxides (NOx) under sunlight. In this study, a field measurement was conducted at a rural site (the backgarden site, or BGS) of the Pearl River Delta (PRD) region in 2006, with the 10 min maximum PAN mixing ratios of 3.9 ppbv observed. The factors influencing the abundance of PAN at the BGS site was evaluated by the process analysis through the Weather Research and Forecasting-Community Multiscale Air Quality (WRF-CMAQ) model. The results suggested that the increase of PAN abundance at the BGS site was mainly controlled by the gas-phase chemistry, followed by vertical transport, while its loss was modulated mainly by dry deposition and horizontal transport. As the dominant important role of gas-phase chemistry, to provide detailed information on the photochemical formation of PAN, a photochemical box model with near-explicit chemical mechanism (i.e., the master chemical mechanism, MCM) was used to explore the relationship of photochemical PAN formation with its precursors based on the measured data at the BGS site. It was found that PAN formation was VOC-limited at the BGS site, with the oxidation of acetaldehyde the most important pathway for photochemical PAN production, followed by the oxidation and photolysis of methylglyoxal (MGLY). Among all the primary VOC precursors, isoprene and xylenes were the main contributors to PAN formation. Overall, our study provides new insights into the PAN photochemical formation and its controlling factors, and highlighted the importance of gas chemistry on the PAN abundance in the PRD region.
ISSN: 2073-4433
DOI: 10.3390/atmos9100372
Rights: © 2018 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (
The following publication Yuan, J., Ling, Z.H., Wang, Z., Lu, X., Fan, S.J., He, Z.R., ... & Wang, N. (2018). PAN-precursor relationship and process analysis of PAN variations in the Pearl River Delta Region. Atmosphere, 9 (10), 372, p. 1-16 is available at
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