Articles | Volume 24, issue 6
https://doi.org/10.5194/acp-24-3627-2024
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-24-3627-2024
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Measurement report: Hygroscopicity of size-selected aerosol particles in the heavily polluted urban atmosphere of Delhi: impacts of chloride aerosol
Anil Kumar Mandariya
Department of Civil Engineering, Indian Institute of Technology Delhi, New Delhi, India
now at: Univ Paris Est Creteil and Université Paris Cité, CNRS, LISA, F-94010 Créteil, France
Ajit Ahlawat
Leibniz Institute for Tropospheric Research (TROPOS), Permoserstraße 15, Leipzig, Germany
Mohammed Haneef
Department of Civil Engineering, Indian Institute of Technology Delhi, New Delhi, India
Nisar Ali Baig
Department of Civil Engineering, Indian Institute of Technology Delhi, New Delhi, India
Kanan Patel
Department of Civil, Architectural and Environmental Engineering, The University of Texas at Austin, Austin, Texas, USA
Joshua Apte
McKetta Department of Chemical Engineering, The University of Texas at Austin, Austin, Texas, USA
Lea Hildebrandt Ruiz
Department of Civil, Architectural and Environmental Engineering, The University of Texas at Austin, Austin, Texas, USA
Leibniz Institute for Tropospheric Research (TROPOS), Permoserstraße 15, Leipzig, Germany
Gazala Habib
CORRESPONDING AUTHOR
Department of Civil Engineering, Indian Institute of Technology Delhi, New Delhi, India
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Cited
12 citations as recorded by crossref.
- Drone measurements reveal high near-surface urban haze A. Ahlawat et al. https://doi.org/10.1038/s44407-025-00044-3
- Influence of meteorological variability on aerosol size distribution during the winter fog campaign over Delhi: a case study A. Srivastava et al. https://doi.org/10.1016/j.jastp.2025.106531
- Intrusion of Marine-continental mixed aerosols disturb cloud properties S. Wang et al. https://doi.org/10.1016/j.atmosenv.2026.121794
- Regional aerosol hygroscopicity influences radiative forcing globally S. Deshmukh et al. https://doi.org/10.1038/s43247-026-03505-z
- Significant contribution of fractal morphology to aerosol light absorption in polluted environments dominated by black carbon (BC) B. Romshoo et al. https://doi.org/10.1038/s41612-024-00634-0
- Direct measurement techniques for atmospheric aerosol: Physical properties review Y. Zhang & Y. Han https://doi.org/10.1016/j.atmosenv.2025.121034
- Intra- and inter-urban variability in chemical characteristics of residential outdoor PM2.5 in Indian metropolitan cities P. Vijay & H. Phuleria https://doi.org/10.1007/s11356-025-36960-w
- Machine learning-based retrieval of aerosol size and hygroscopicity using horizontal scanning LiDAR and PM data J. Shin et al. https://doi.org/10.1038/s41612-025-01276-6
- Investigating the role of aerosol in-situ pH in controlling ambient visibility at an urban location in the foothills of Northwestern Himalaya S. Bamotra et al. https://doi.org/10.1016/j.apr.2026.102907
- Increased particle mass deposition on lung tissue due to industrial and waste-burning activities A. Das et al. https://doi.org/10.1016/j.envint.2025.109548
- Hygroscopicity of Organic Compounds as a Function of Their Physicochemical Properties N. Raparthi et al. https://doi.org/10.1021/acsestair.5c00061
- Treatment of Key Aerosol and Cloud Processes in Earth System Models – Recommendations from the FORCeS Project I. Riipinen et al. https://doi.org/10.16993/tellusb.1883
12 citations as recorded by crossref.
- Drone measurements reveal high near-surface urban haze A. Ahlawat et al. https://doi.org/10.1038/s44407-025-00044-3
- Influence of meteorological variability on aerosol size distribution during the winter fog campaign over Delhi: a case study A. Srivastava et al. https://doi.org/10.1016/j.jastp.2025.106531
- Intrusion of Marine-continental mixed aerosols disturb cloud properties S. Wang et al. https://doi.org/10.1016/j.atmosenv.2026.121794
- Regional aerosol hygroscopicity influences radiative forcing globally S. Deshmukh et al. https://doi.org/10.1038/s43247-026-03505-z
- Significant contribution of fractal morphology to aerosol light absorption in polluted environments dominated by black carbon (BC) B. Romshoo et al. https://doi.org/10.1038/s41612-024-00634-0
- Direct measurement techniques for atmospheric aerosol: Physical properties review Y. Zhang & Y. Han https://doi.org/10.1016/j.atmosenv.2025.121034
- Intra- and inter-urban variability in chemical characteristics of residential outdoor PM2.5 in Indian metropolitan cities P. Vijay & H. Phuleria https://doi.org/10.1007/s11356-025-36960-w
- Machine learning-based retrieval of aerosol size and hygroscopicity using horizontal scanning LiDAR and PM data J. Shin et al. https://doi.org/10.1038/s41612-025-01276-6
- Investigating the role of aerosol in-situ pH in controlling ambient visibility at an urban location in the foothills of Northwestern Himalaya S. Bamotra et al. https://doi.org/10.1016/j.apr.2026.102907
- Increased particle mass deposition on lung tissue due to industrial and waste-burning activities A. Das et al. https://doi.org/10.1016/j.envint.2025.109548
- Hygroscopicity of Organic Compounds as a Function of Their Physicochemical Properties N. Raparthi et al. https://doi.org/10.1021/acsestair.5c00061
- Treatment of Key Aerosol and Cloud Processes in Earth System Models – Recommendations from the FORCeS Project I. Riipinen et al. https://doi.org/10.16993/tellusb.1883
Saved (final revised paper)
Latest update: 11 Jun 2026
Short summary
The current study explores the temporal variation of size-selected particle hygroscopicity in Delhi for the first time. Here, we report that the high volume fraction contribution of ammonium chloride to aerosol governs the high aerosol hygroscopicity and associated liquid water content based on the experimental data. The episodically high ammonium chloride present in Delhi's atmosphere could lead to haze and fog formation under high relative humidity in the region.
The current study explores the temporal variation of size-selected particle hygroscopicity in...
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