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Preprints
https://doi.org/10.5194/acp-2020-11
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2020-11
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  28 Feb 2020

28 Feb 2020

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A revised version of this preprint was accepted for the journal ACP and is expected to appear here in due course.

Source characterization of volatile organic compounds measured by PTR-ToF-MS in Delhi, India

Liwei Wang1, Jay G. Slowik1, Nidhi Tripathi2, Deepika Bhattu1, Pragati Rai1, Varun Kumar1, Pawan Vats4, Rangu Satish5,a, Urs Baltensperger1, Dilip Ganguly4, Neeraj Rastogi5, Lokesh K. Sahu2, Sachchida N. Tripathi3, and André S. H. Prévôt1 Liwei Wang et al.
  • 1Laboratory of Atmospheric Chemistry, Paul Scherrer Institute, Villigen, 5232, Switzerland
  • 2Space and Atmospheric Sciences Division, Physical Research Laboratory, Ahmedabad 380009, India
  • 3Department of Civil Engineering and Centre for Environmental Science and Engineering, Indian Institute of Technology Kanpur, Kanpur 208016, India
  • 4Centre for Atmospheric Sciences, Indian Institute of Technology Delhi, New Delhi 110016, India
  • 5Geosciences Division, Physical Research Laboratory, Ahmedabad 380009, India
  • anow at: Department of Environmental Science and Analytical Chemistry, Stockholm University, Stockholm 11419, Sweden

Abstract. Characteristics and sources of volatile organic compounds (VOCs) were investigated with highly time-resolved simultaneous measurements by two proton-transfer-reaction time-of-flight mass spectrometers (PTR-ToF-MS) at an urban and a suburban site in New Delhi, India from January to March 2018. During the measurement period, high mixing ratios of VOCs and trace gases were observed, with high nocturnal mixing ratios and strong day-night variations. The positive matrix factorization (PMF) receptor model was applied separately to the two sites, and six major factors of VOCs were identified at both sites, i.e., two factors related to traffic emissions, two to solid fuel combustion, and two secondary factors. At the urban IITD site, traffic-related emissions comprising mostly mono-aromatic compounds were the dominant sources, contributing 56.6 % of the total mixing ratio, compared to 36.0 % at the suburban MRIU site. Emissions from various solid fuel combustion processes, particularly in the night, were identified as a significant source of aromatics, phenols and furans at both sites. The secondary factors accounted for 15.9 % of the total VOC concentration at IITD and for 33.6 % at MRIU. They were dominated by oxygenated VOCs and exhibited substantially higher contributions during daytime.

Liwei Wang et al.

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Liwei Wang et al.

Liwei Wang et al.

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