Khombole Air Quality Index (AQI)

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Khombole, nestled within the Thiès Region of Senegal, occupies a geographically significant position on the edge of the Sahel, a transitional zone between the Sahara Desert and West African savannas. Located at approximately 14.7629° N, 16.6909° W, the town’s terrain is predominantly flat, characteristic of the low-lying coastal plains of Senegal. Its elevation is minimal, contributing to a tendency for pollutants to linger closer to ground level. Khombole’s proximity to the Atlantic Ocean, roughly 30 kilometers west, introduces a maritime influence, generally moderating temperatures but also occasionally bringing in coastal fog and humidity, which can trap particulate matter under certain atmospheric conditions. The surrounding landscape is a mosaic of small-scale agriculture – primarily millet, sorghum, and groundnuts – interspersed with acacia woodlands and scrubland. This agricultural activity, while vital to the local economy, can contribute to seasonal dust and biomass burning episodes. Further inland, towards the Thiès industrial belt, lies a gradual urban–rural gradient, with increasing concentrations of light industry and processing facilities. The town itself is a relatively small settlement, exhibiting a traditional West African urban character with a mix of modern and vernacular architecture. The lack of significant topographical barriers within a 50-kilometer radius means that air pollutants generated within Khombole and surrounding areas can readily disperse, but also that regional pollution events can impact the town’s air quality. The prevailing winds, generally from the west, play a crucial role in determining the direction of pollutant transport.

Khombole experiences a tropical savanna climate, characterized by distinct wet and dry seasons, profoundly influencing its air quality profile. The dry season, typically spanning November to May, is marked by consistently high temperatures and low humidity. This period often sees a significant increase in dust originating from the Sahel and the Sahara, carried by the Harmattan winds. These winds, blowing from the northeast, can dramatically reduce visibility and elevate particulate matter concentrations. Temperature inversions, common during the cooler nights of the dry season, further exacerbate the problem by trapping pollutants near the ground. The wet season, from June to October, brings relief from the dust, as rainfall washes pollutants from the atmosphere and increased humidity helps to bind particulate matter. However, biomass burning associated with agricultural practices, particularly during land clearing in late June and July, can generate localized smoke plumes. Fog, occasionally forming along the coast, can also trap pollutants, especially during the transitional periods between seasons. Outdoor activities are generally best enjoyed during the wet season, particularly August and September, when rainfall is frequent and dust levels are lower. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the Harmattan season (December to February) and avoid prolonged outdoor exposure when biomass burning is prevalent. Maintaining indoor air quality through ventilation and air filtration can also provide some protection during periods of elevated pollution.