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Molepolole, Botswana’s largest village, occupies a significant position within the Kweneng District, approximately 65 kilometers west of Gaborone. The town is situated on a relatively flat, gently undulating plateau at an elevation around 915 meters, part of the larger Kalahari Basin. This basin’s characteristic sandy soils and sparse vegetation influence local air quality, contributing to dust resuspension, particularly during drier periods. Unlike cities near major water bodies, Molepolole lacks substantial surface water features nearby, relying on groundwater resources. The surrounding landscape is predominantly savannah woodland, transitioning into more arid scrubland further west. The urban-rural gradient is pronounced; the town centre exhibits denser development, while the periphery quickly dissolves into agricultural lands – primarily cattle ranching and subsistence farming. This agricultural activity, alongside increasing vehicle traffic associated with Molepolole’s growth as a regional commercial hub, contributes to particulate matter pollution. The lack of significant industrial belts within the immediate vicinity means that industrial emissions are less of a direct concern than dust and vehicle exhaust. The prevailing winds, generally from the south-east, can transport pollutants from Gaborone, impacting local air quality, while also dispersing some locally generated emissions. The town’s location within the Kalahari Basin also means limited natural ventilation, potentially exacerbating pollution episodes.

Molepolole experiences a distinct wet and dry season, heavily influencing air quality. The dry season, spanning roughly May to October, is characterized by consistently low humidity and increased dust levels. This is when air quality is typically poorest, as dry, loose soil is easily lifted by wind, creating significant particulate matter pollution. November marks the beginning of the rainy season, bringing a gradual improvement in air quality as rainfall suppresses dust. December to February are the wettest months, offering the cleanest air, though increased humidity can sometimes trap pollutants near the ground. Temperature inversions, common during the cooler mornings of the dry season, can exacerbate pollution by preventing vertical mixing of air. March and April represent a transitional period, with fluctuating rainfall and moderate air quality. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit strenuous outdoor activity during the peak of the dry season (June-August). During the wet season, while air quality is generally good, increased mould growth indoors can pose a risk to allergy sufferers. Monitoring wind patterns is crucial; strong southerly winds can bring dust from surrounding areas, even during the wet season.