气候变化领域集成服务门户(CCPortal): PM1 composition and source apportionment at two sites in Delhi, India, across multiple seasons

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DOI	10.5194/acp-21-11655-2021
	PM1 composition and source apportionment at two sites in Delhi, India, across multiple seasons
	Reyes-Villegas E.; Panda U.; Darbyshire E.; Cash J.M.; Joshi R.; Langford B.; Di Marco C.F.; Mullinger N.J.; Alam M.S.; Crilley L.R.; Rooney D.J.; Acton W.J.F.; Drysdale W.; Nemitz E.; Flynn M.; Voliotis A.; McFiggans G.; Coe H.; Lee J.; Hewitt C.N.; Heal M.R.; Gunthe S.S.; Mandal T.K.; Gurjar B.R.; Shivani; Gadi R.; Singh S.; Soni V.; Allan J.D.
发表日期	2021
ISSN	1680-7316
起始页码	11655
结束页码	11667
卷号	21 期号:15
英文摘要	Air pollution in urban environments has been shown to have a negative impact on air quality and human health, particularly in megacities. Over recent decades, Delhi, India, has suffered high atmospheric pollution, with significant particulate matter (PM) concentrations as a result of anthropogenic activities. Organic aerosols (OAs) are composed of thousands of different chemical species and are one of the main constituents of submicron particles. However, quantitative knowledge of OA composition, their sources and their processes in urban environments is still limited. This is important particularly in India, as Delhi is a massive, inhomogeneous conurbation, where we would expect the apportionment and concentrations to vary depending on where in Delhi the measurements/source apportionment is performed, indicating the need for multisite measurements. This study presents the first multisite analysis carried out in India over different seasons, with a focus on identifying OA sources. The measurements were taken during 2018 at two sites in Delhi, India. One site was located at the India Meteorological Department, New Delhi (ND). The other site was located at the Indira Gandhi Delhi Technical University for Women, Old Delhi (OD). Non-refractory submicron aerosol (NR-PM1) concentrations (ammonium, nitrate, sulfate, chloride and organic aerosols) of four aerosol mass spectrometers were analysed. Collocated measurements of volatile organic compounds, black carbon, NOx and CO were performed. Positive matrix factorisation (PMF) analysis was performed to separate the organic fraction, identifying a number of conventional factors: hydrocarbon-like OAs (HOAs) related to traffic emissions, biomass burning OAs (BBOAs), cooking OAs (COAs) and secondary OAs (SOAs). A composition-based estimate of PM1 is defined by combining black carbon (BC) and NR-PM1 (C-PM1Combining double low lineg BCg +g NR-PM1). No significant difference was observed in C-PM1 concentrations between sites, OD (142g ±g 117g μgg m-3) compared to ND (123g ±g 71g μgg m3), from post-monsoon measurements. A wider variability was observed between seasons, where pre-monsoon and monsoon showed C-PM1 concentrations lower than 60g μgg m-3. A seasonal variation in C-PM1 composition was observed; SO42- showed a high contribution over pre-monsoon and monsoon seasons, while NO3- and Cl- had a higher contribution in winter and post-monsoon. The main primary aerosol source was from traffic, which is consistent with the PMF analysis and Aethalometer model analysis. Thus, in order to reduce PM1 concentrations in Delhi through local emission controls, traffic emission control offers the greatest opportunity. PMF-aerosol mass spectrometer (AMS) mass spectra will help to improve future aerosol source apportionment studies. The information generated in this study increases our understanding of PM1 composition and OA sources in Delhi, India. Furthermore, the scientific findings provide significant information to strengthen legislation that aims to improve air quality in India. © 2021 The Author(s).
语种	英语
scopus关键词	aerosol; air quality; atmospheric pollution; black carbon; carbon monoxide; concentration (composition); nitrogen oxides; particulate matter; seasonal variation; source apportionment; volatile organic compound; Delhi; India
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/246681
作者单位	Department of Earth and Environmental Sciences, University of Manchester, Manchester, M13 9PL, United Kingdom; EWRE Division, Dept. of Civil Engineering, Indian Institute of Technology Madras, Chennai, 600036, India; UK Centre for Ecology and Hydrology, Edinburgh Research Station, Penicuik, EH26 0QB, United Kingdom; School of Chemistry, University of Edinburgh, Edinburgh, EH9 3FJ, United Kingdom; School of Geography, Earth and Environmental Sciences, University of Birmingham, Birmingham, B15 2TT, United Kingdom; Lancaster Environment Centre, Lancaster University, Lancaster, LA1 4YQ, United Kingdom; Wolfson Atmospheric Chemistry Laboratories, University of York, York, YO10 5DD, United Kingdom; Laboratory for Atmospheric and Climate Sciences, Indian Institute of Technology Madras, Chennai, 600036, India; CSIR-National Physical Laboratory, Dr. K.S. Krishnan Marg, New Delhi, 110012, India; Dept. of Civil Engineering, Indian Institute of Technology, Roorkee, India; Department of Applied Sciences and Humanities...
推荐引用方式 GB/T 7714	Reyes-Villegas E.,Panda U.,Darbyshire E.,et al. PM1 composition and source apportionment at two sites in Delhi, India, across multiple seasons[J],2021,21(15).
APA	Reyes-Villegas E..,Panda U..,Darbyshire E..,Cash J.M..,Joshi R..,...&Allan J.D..(2021).PM1 composition and source apportionment at two sites in Delhi, India, across multiple seasons.ATMOSPHERIC CHEMISTRY AND PHYSICS,21(15).
MLA	Reyes-Villegas E.,et al."PM1 composition and source apportionment at two sites in Delhi, India, across multiple seasons".ATMOSPHERIC CHEMISTRY AND PHYSICS 21.15(2021).