Articles | Volume 20, issue 14
https://doi.org/10.5194/acp-20-8533-2020
© Author(s) 2020. 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-20-8533-2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
22 Jul 2020
Research article |
| 22 Jul 2020
| 22 Jul 2020
Particle number concentrations and size distribution in a polluted megacity: the Delhi Aerosol Supersite study
Shahzad Gani
Department of Civil, Architectural and Environmental Engineering, The University of Texas at Austin, Austin, Texas, USA
Sahil Bhandari
McKetta Department of Chemical Engineering, The University of Texas at Austin, Austin, Texas, USA
Kanan Patel
McKetta Department of Chemical Engineering, The University of Texas at Austin, Austin, Texas, USA
Sarah Seraj
Department of Civil, Architectural and Environmental Engineering, The University of Texas at Austin, Austin, Texas, USA
Prashant Soni
Department of Civil Engineering, Indian Institute of Technology Delhi, New Delhi, India
Zainab Arub
Department of Civil Engineering, Indian Institute of Technology Delhi, New Delhi, India
Gazala Habib
Department of Civil Engineering, Indian Institute of Technology Delhi, New Delhi, India
McKetta Department of Chemical Engineering, The University of Texas at Austin, Austin, Texas, USA
Department of Civil, Architectural and Environmental Engineering, The University of Texas at Austin, Austin, Texas, USA
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43 citations as recorded by crossref.
- Estimation of real-time brown carbon absorption: An observationally constrained Mie theory-based optimization method T. Kapoor et al. 10.1016/j.jaerosci.2022.106047
- Air pollution from unconventional oil and gas development in the Eagle Ford Shale K. McPherson et al. 10.1016/j.atmosenv.2024.120812
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- Assessment of the Physicochemical Properties of Ultrafine Particles (UFP) from Vehicular Emissions in a Commercial Parking Garage: Potential Health Implications N. Vaze et al. 10.3390/toxics12110833
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- Measurement report: Interpretation of wide-range particulate matter size distributions in Delhi Ü. Şahin et al. 10.5194/acp-22-5415-2022
- Observations of particle number size distributions and new particle formation in six Indian locations M. Sebastian et al. 10.5194/acp-22-4491-2022
- Characteristics of Aerosol Size Distributions and New Particle Formation Events at Delhi: An Urban Location in the Indo-Gangetic Plains S. Jose et al. 10.3389/feart.2021.750111
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- A hybrid model for estimating the number concentration of ultrafine particles based on machine learning algorithms in central Taiwan C. Jung et al. 10.1016/j.envint.2023.107937
- Quantifying the dominant sources influencing the 2016 particulate matter pollution episode over northern India P. Agarwal et al. 10.1039/D3EA00174A
- Atmospheric new particle formation in India: Current understanding and knowledge gaps V. Kanawade et al. 10.1016/j.atmosenv.2021.118894
- Exploring the influence of physical and chemical factors on new particle formation in a polluted megacity U. Ali et al. 10.1039/D4EA00114A
- Ultrafine particles: Sources, toxicity, and deposition dynamics in the human respiratory tract —— experimental and computational approaches L. Chen et al. 10.1016/j.jenvman.2025.124458
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- Persistence of Primary and Secondary Pollutants in Delhi: Concentrations and Composition from 2017 through the COVID Pandemic K. Patel et al. 10.1021/acs.estlett.1c00211
- Ambient ultrafine particle (PM0.1): Sources, characteristics, measurements and exposure implications on human health S. Abdillah & Y. Wang 10.1016/j.envres.2022.115061
- Comparison of aerosol number size distribution and new particle formation in summer at alpine and urban regions in the Guanzhong Plain, Northwest China H. Liu et al. 10.1016/j.scitotenv.2024.176601
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Latest update: 23 Apr 2025
Short summary
Delhi, India, has had the highest fine particle mass (PM2.5; diameter < 2.5 µm) concentrations of any megacity on the planet in recent years. Here, we undertook a year of detailed measurements of particle size distributions. We observed that the number count of ultrafine particles (diameter < 100 nm) – unlike PM2.5 – is not dramatically elevated in Delhi. Using observations and a simple model, we illustrate how the high amount of PM2.5 in Delhi may suppress ultrafine particle concentrations.
Delhi, India, has had the highest fine particle mass (PM2.5; diameter < 2.5 µm) concentrations of any megacity on the planet in recent years. Here, we undertook a year of detailed measurements of particle size distributions. We observed that the number count of ultrafine particles (diameter < 100 nm) – unlike PM2.5 – is not dramatically...
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