Articles | Volume 25, issue 15
https://doi.org/10.5194/acp-25-8769-2025
© Author(s) 2025. 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-25-8769-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
12 Aug 2025
Research article |
| 12 Aug 2025
| 12 Aug 2025
Regional transport of aerosols from northern India and its impact on boundary layer height and air quality over Chennai, a coastal megacity in southern India
Saleem Ali
Department of Civil Engineering, Indian Institute of Technology Madras, Chennai, 600036, India
Department of Mathematics and Physics, Amal College of Advanced Studies (Autonomous), Nilambur, Kerala, 679329, India
Chandan Sarangi
CORRESPONDING AUTHOR
Department of Civil Engineering, Indian Institute of Technology Madras, Chennai, 600036, India
Sanjay Kumar Mehta
Atmospheric Observations and Modelling Laboratory (AOML), Department of Physics and Nanotechnology, SRM Institute of Science and Technology, Kattankulathur, 603203, India
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Short summary
The pollutants over northern India are transported towards southern India under the influence of the prevalent wind system, especially during the winter season. This long-range transport induces widespread haziness over southern India, lasting for days. We evaluated the occurrence of such transport episodes over southern India using observational methods and found that it suppresses the boundary layer height by approximately 40 % compared to clear days, while exacerbating the surface pollution by approximately 50 %–60 %.
The pollutants over northern India are transported towards southern India under the influence of...
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