Author(s)

Moustapha Kebe^1*, Samba Dia¹, Alassane Traore¹, Modou Gueye², Joel Lamine Isidore Manga³

¹Department of Physics, Faculty of Science and Technology, Cheikh Anta Diop University, Dakar, Senegal.
²Department of Mathematics and Computer Science, Faculty of Science and Technology, Cheikh Anta Diop University, Dakar, Senegal.
³Department of Geography, Faculty of Arts and Humanities, Cheikh Anta Diop University, Dakar, Senegal.

Particulate matter (PM) with an aerodynamic diameter of 2.5 μm or less (PM_2.5) poses a significant threat to human health. This study employs the Gaussian model to simulate the dispersion of PM_2.5 in Yoff from 2018 to 2019. A total of 69 PM_2.5 samples were collected using the Gent stacked filter unit sampler, with an average concentration of 292.4 ± 43.2 µg·m⁻³. The simulation was conducted under neutral atmospheric conditions (stability class D), following Pasquill’s stability classification. The findings indicate that PM_2.5 disperses up to approximately 2,800 meters from the source. Higher concentrations were observed to the north (N) and North-Northwest (NNW), primarily due to the influence of sea salts and secondary sulphur, affecting locations such as Yoff Bay and the Yoff Tangor market. Additionally, traffic emissions from the West (W) and West-Southwest (WSW) contribute to increased pollution, impacting sensitive areas such as Philippe Maguilen Senghor Hospital, the Océan Hotel, and the military base. Further away, Grand Yoff and Parcelles Assainies are also affected by PM_2.5 dispersion. This study identifies road traffic and sea salt/secondary sulphur as the primary sources of PM_2.5 pollution in Dakar. These findings play a crucial role in air quality management in Yoff, enabling local authorities to forecast pollutant dispersion and implement measures to protect both the environment and public health.

Health, Gaussian, Simulation, Pollution

Kebe, M. , Dia, S. , Traore, A. , Gueye, M. and Manga, J. (2025) Air Pollutant Dispersion Pattern around Yoff, Dakar. Open Journal of Air Pollution, 14, 41-50. doi: 10.4236/ojap.2025.142004.