Articles | Volume 20, issue 14
https://doi.org/10.5194/acp-20-8533-2020
https://doi.org/10.5194/acp-20-8533-2020
Research article
 | 
22 Jul 2020
Research article |  | 22 Jul 2020

Particle number concentrations and size distribution in a polluted megacity: the Delhi Aerosol Supersite study

Shahzad Gani, Sahil Bhandari, Kanan Patel, Sarah Seraj, Prashant Soni, Zainab Arub, Gazala Habib, Lea Hildebrandt Ruiz, and Joshua S. Apte

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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.
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