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Karaga, a small city in Ghana’s Northern Region, sits at approximately 9.9250°N latitude and -0.4297°W longitude, with a population of around 15,581. The city is situated within the Guinea Savannah ecological zone, characterised by undulating terrain and a generally flat landscape. Elevation is relatively low, contributing to limited natural dispersion of pollutants. Karaga’s geography is dominated by expansive grasslands interspersed with scattered trees, typical of the savannah. The surrounding area is largely agricultural, with significant millet, yam, and maize cultivation. This agricultural activity, while vital to the local economy, contributes to particulate matter pollution through land preparation, harvesting, and the burning of residual biomass. The White Volta River lies to the east, but its distance doesn’t provide significant mitigating effects on local air quality. The urban-rural gradient is pronounced; Karaga itself is a relatively compact settlement, but surrounding villages and farmland extend outwards. Dust from unpaved roads and open fields is a constant factor. The city’s location, further inland, means it lacks the coastal breezes that can help clear pollutants. The concentration of economic activity within the city centre, coupled with increasing motorcycle traffic, exacerbates localised pollution hotspots. Understanding this geographical context is crucial for addressing Karaga’s air quality challenges.

Karaga experiences a distinct tropical wet and dry climate, profoundly influencing its air quality. The dry season, roughly November to March, is typically the period of poorest air quality. Harmattan winds, originating from the Sahara, carry substantial amounts of dust and particulate matter southward, blanketing Karaga and significantly increasing PM10 and PM2.5 levels. January and February are particularly challenging months. The dry heat also encourages the burning of vegetation for agricultural purposes, further degrading air quality. The transition to the wet season, April to May, brings a temporary improvement as rainfall washes away accumulated dust and suppresses dust resuspension. However, increased humidity can also foster mould growth, potentially impacting respiratory health. The wet season, June to October, generally offers the best air quality, with frequent rainfall acting as a natural scrubber. However, localised flooding can create stagnant water, breeding grounds for disease vectors and potentially contributing to biological pollutants. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit outdoor exposure during the Harmattan and periods of agricultural burning. Monitoring wind patterns and avoiding peak agricultural activity times are advisable.