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Baham, situated in the Ouest region of Cameroon at approximately 5.3333°N, 10.4000°E, is a town characterized by a humid equatorial climate and a landscape transitioning between coastal plains and the beginnings of the Cameroon plateau. The town’s elevation is relatively low, contributing to limited atmospheric dispersion of pollutants. Baham lies inland, approximately 30km from the Atlantic coastline, meaning direct marine influences on air quality are lessened, but humidity remains consistently high. The surrounding area is predominantly agricultural, with significant cocoa and coffee plantations, and smaller-scale subsistence farming. This agricultural activity contributes to particulate matter from land preparation, harvesting, and potential burning of agricultural waste. While Baham isn’t a major industrial hub, regional trade and processing of agricultural products generate localized emissions. The urban-rural gradient is fairly sharp; Baham itself is a relatively small urban centre, quickly giving way to rural farmland. This proximity to agricultural sources, combined with the low elevation and limited wind flow due to the surrounding terrain, creates conditions where pollutants can accumulate, particularly during periods of atmospheric stability. The town’s position within a river basin further restricts air circulation, exacerbating pollution episodes. Understanding these geographical factors is crucial for assessing and mitigating air quality challenges in Baham.

Baham experiences a distinct wet and dry season cycle, heavily influencing air quality. The dry season, typically from November to March, sees a peak in particulate matter pollution. Reduced rainfall means less atmospheric scavenging of dust and pollutants, while increased use of biomass burning for cooking and agricultural practices contribute to higher concentrations of PM2.5 and PM10. Harmattan winds, originating from the Sahara, can transport significant amounts of dust, further degrading air quality during these months. February and March are generally the worst periods for respiratory health. The transition period, April-May, brings increased rainfall and a gradual improvement in air quality. The wet season, from June to October, generally offers the best air quality due to frequent rainfall washing away pollutants. However, high humidity can promote the formation of mold and allergens, impacting sensitive individuals. September and October, while wet, can experience localized flooding which stirs up sediment and increases bacterial counts. During the wet season, indoor air quality can become a concern due to dampness. Sensitive groups – children, the elderly, and those with respiratory conditions – should take extra precautions during the dry season and monitor conditions closely.