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DOI	10.5194/acp-21-9931-2021
	Measurement report: The influence of traffic and new particle formation on the size distribution of 1-800nm particles in Helsinki-a street canyon and an urban background station comparison
	Okuljar M.; Kuuluvainen H.; Kontkanen J.; Garmash O.; Olin M.; Niemi J.V.; Timonen H.; Kangasluoma J.; Tham Y.J.; Baalbaki R.; Sipilä M.; Salo L.; Lintusaari H.; Portin H.; Teinilä K.; Aurela M.; Dal Maso M.; Rönkkö T.; Petäjä T.; Paasonen P.
发表日期	2021
ISSN	1680-7316
起始页码	9931
结束页码	9953
卷号	21 期号:13
英文摘要	Most of the anthropogenic air pollution sources are located in urban environments. The contribution of these sources to the population of atmospheric particles in the urban environment is poorly known. In this study, we investigated the aerosol particle number concentrations in a diameter range from 1 to 800nm at a street canyon site and at a background station within 1km from each other in Helsinki, Finland. We use these number size distribution data together with complementary trace gas data and develop a method to estimate the relative contributions of traffic and atmospheric new particle formation (NPF) to the concentrations of sub-3nm particles. During the daytime, the particle concentrations were higher at the street canyon site than at the background station in all analyzed modes: sub-3nm particles, nucleation mode (3-25nm), Aitken mode (25-100nm), and accumulation mode (100-800nm). The population of sub-3nm and nucleation mode particles was linked to local sources such as traffic, while the accumulation mode particles were more related to non-local sources. Aitken mode particles were dominated by local sources at the street canyon site, while at the background station they were mainly influenced by non-local sources. The results of this study support earlier research showing direct emissions of the sub-3nm particles from traffic. However, by using our new method, we show that, during NPF events, traffic contribution to the total sub-3nm particle concentration can be small and during daytime (6:00-20:00) in spring it does not dominate the sub-3nm particle population at either of the researched sites. In the future, the contribution of traffic to particle number concentrations in different urban environments can be estimated with a similar approach, but determining the relationships between the gas and particle concentrations from observations needs to be conducted with longer data sets from different urban environments. © Copyright:
语种	英语
scopus关键词	air quality; atmospheric pollution; carbon emission; concentration (composition); numerical model; street canyon; trace gas; traffic emission; Finland; Helsinki; Varsinais-Suomi
来源期刊	ATMOSPHERIC CHEMISTRY AND PHYSICS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/246764
作者单位	Institute of Atmospheric and Earth System Science/Physics, Faculty of Science, University of Helsinki, Helsinki, 00014, Finland; Aerosol Physics Laboratory, Physics Unit, Tampere University, P.O. Box 692, Tampere, 33014, Finland; Helsinki Region Environmental Services Authority, P.O. Box 100, Helsinki, 00066, Finland; Atmospheric Composition Research, Finnish Meteorological Institute, P.O. Box 503, Helsinki, 00101, Finland
推荐引用方式 GB/T 7714	Okuljar M.,Kuuluvainen H.,Kontkanen J.,et al. Measurement report: The influence of traffic and new particle formation on the size distribution of 1-800nm particles in Helsinki-a street canyon and an urban background station comparison[J],2021,21(13).
APA	Okuljar M..,Kuuluvainen H..,Kontkanen J..,Garmash O..,Olin M..,...&Paasonen P..(2021).Measurement report: The influence of traffic and new particle formation on the size distribution of 1-800nm particles in Helsinki-a street canyon and an urban background station comparison.ATMOSPHERIC CHEMISTRY AND PHYSICS,21(13).
MLA	Okuljar M.,et al."Measurement report: The influence of traffic and new particle formation on the size distribution of 1-800nm particles in Helsinki-a street canyon and an urban background station comparison".ATMOSPHERIC CHEMISTRY AND PHYSICS 21.13(2021).