_____________________________________________________________________________________________________ *Corresponding author: E-mail: obisesanomodara@gmail.com; Physical Science International Journal 25(7): 30-40, 2021; Article no.PSIJ.74760 ISSN: 2348-0130 Estimation of Atmospheric Turbidity Parameters in Ile-Ife, Nigeria Omodara E. Obisesan 1* 1 Department of Physics and Engineering Physics, Obafemi Awolowo University, Ile-Ife, Nigeria. Author’s contribution The sole author designed, analyzed, interpreted and prepared the manuscript. Article Information DOI: 10.9734/PSIJ/2021/v25i730270 Editor(s): (1) Dr. Lei Zhang, Winston-Salem State University, USA. (2) Dr. Thomas F. George, University of Missouri-St. Louis, USA. Reviewers: (1) Abderrahim Ayad, Abdelmalek Essaâdi University, Morocco. (2) Irfan Ahmad Afip, University of Malaya, Malaysia. (3) Silvia Raquel García Benitez, Universidad Nacional Autónoma de México, México. Complete Peer review History: http://www.sdiarticle4.com/review-history/74760 Received 04 August 2021 Accepted 08 October 2021 Published 04 November 2021 ABSTRACT This study estimated the levels of atmospheric turbidity in Ile-Ife, a tropical location in the Southwest of Nigeria, from November, 2017 to March, 2019. This was with the aim to quantify the degree of atmospheric cleanliness of the study location. The methods of estimation used are: the Angstrom turbidity parameters (α and β), Linke turbidity factor (T L ) and horizontal visibility (V H ). The values of α and β range between 0.6 and 1.4; 0.10 and 0.91 respectively. The values obtained for T L varied between 1 and 7 while visibility values ranged between 2 and 14 km. Maximum values of β and T L (corresponding to low values of V H ) were obtained in the dry season (particularly in the months of January and February) while the lowest values of the same methods of estimation (corresponding to high values of V H ) were recorded in the wet season (specifically in August and September). The elevated turbidity observed in the dry season was linked to episodes of Harmattan dust storms usually experienced at the study location. The study concluded that a polluted atmosphere dominates the study location especially in the dry season as indicated by the different atmospheric turbidity parameters. Keywords: Turbidity; harmattan; visibility; dry season; wet season. 1. INTRODUCTION Atmospheric turbidity is a dimensionless quantity which describes the opacity and the total vertical aerosol loading present in the atmosphere [1]. In a clear dry (cloudless) atmosphere, the radiative transfer strongly depends on turbidity due to aerosols. An atmosphere is described as turbid if Original Research Article