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Sci Total Environ

Title:		High contribution of new particle formation to ultrafine particles in four seasons in an urban atmosphere in south China
Author(s):		Tao L; Zhou Z; Tao J; Zhang L; Wu C; Li J; Yue D; Wu Z; Zhang Z; Yuan Z; Huang J; Wang B;
Address:		"Institute for Environmental and Climate Research, Jinan University, Guangzhou, China. Dongguan Sub-branch of Guangdong Ecological and Environmental Monitoring Center, Dongguan, China. Institute for Environmental and Climate Research, Jinan University, Guangzhou, China; South China Institute of Environmental Sciences, Ministry of Ecology and Environment, Guangzhou, China. Electronic address: taojun@jnu.edu.cn. Air Quality Research Division, Science and Technology Branch, Environment and Climate Change Canada, Toronto, Canada. Institute of Mass Spectrometer and Atmospheric Environment, Jinan University, Guangzhou, China. RCE-TEA, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China. Guangdong Ecological and Environmental Monitoring Center, Guangzhou, China. State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing, China. South China Institute of Environmental Sciences, Ministry of Ecology and Environment, Guangzhou, China. Sailbri Cooper Inc., Tigard, Oregon, United States"
Journal Title:		Sci Total Environ
Year:		2023
Volume:		20230518
Issue:
Page Number:		164202 -
DOI:		10.1016/j.scitotenv.2023.164202
ISSN/ISBN:		1879-1026 (Electronic) 0048-9697 (Linking)
Abstract:		"Ultra fine particles (UFP) cover the size range of both nucleation mode particles (NUC, D(p) < 25 nm) and Aitken mode particles (AIT, 25 nm < D(p) < 100 nm), and play important roles in radiative forcing and human health. In this study, we identified new particle formation (NPF) events and undefined events, explored their potential formation mechanism, and quantified their contributions to UFP number concentration (N(UFP)) in urban Dongguan of the Pearl River Delta (PRD) region. Field campaigns were carried out in four seasons in 2019 to measure particle number concentration in the size range of 4.7-673.2 nm, volatile organic compounds (VOCs), gaseous pollutants, chemical compositions in PM(2.5), and meteorological parameters. The frequency of the occurrence of NPF, as indicated by a significant increase in NUC number concentration (N(NUC)), was 26 %, and that of the undefined event, as indicated by substantial increases in N(NUC) or AIT number concentration (N(AIT)), was 32 % during the whole campaign period. The NPF events mainly occurred in autumn (with a frequency of 59 %) and winter (33 %) and only occasionally in spring (4 %) and summer (4 %). On the contrary, the frequencies of the undefined events were higher in spring (52 %) and summer (38 %) than in autumn (19 %) and winter (22 %). The burst periods of the NPF events mainly occurred before 11:00 Local Time (LT), while those of the undefined events mainly occurred after 11:00 LT. Accompanied to NPF events were low concentrations of VOCs and high concentrations of O(3). The undefined events by NUC or AIT were associated with the upwind transport of newly formed particles. Source apportionment analysis suggested that NPF and undefined events were the largest contributor to N(NUC) (51 +/- 28 %), N(AIT) (41 +/- 26 %), and N(UFP) (45 +/- 27 %), while coal combustion and biomass burning, and traffic emission were the second largest contributor to N(NUC) (22 +/- 20 %) and N(AIT) (39 +/- 28 %), respectively"
Keywords:		Humans *Particulate Matter/analysis *Air Pollutants/analysis Seasons Particle Size Environmental Monitoring Atmosphere/chemistry China Aerosols/analysis Aitken mode particle Biomass burning Coal combustion Nucleation mode particle Traffic emission Upwind;
Notes:		"PubMed-not-MEDLINETao, Li Zhou, Zhen Tao, Jun Zhang, Leiming Wu, Cheng Li, Jiawei Yue, Dingli Wu, Zhijun Zhang, Zhisheng Yuan, Ziyang Huang, Junjun Wang, Boguang eng Netherlands 2023/05/20 Sci Total Environ. 2023 Sep 1; 889:164202. doi: 10.1016/j.scitotenv.2023.164202. Epub 2023 May 18"