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Quilengues, situated in the Huíla Province of Angola at coordinates -14.0814, 14.0931, occupies a unique geographical position within the country’s southern highlands. The city’s elevation, approximately 1,760 meters (5,774 feet) above sea level, significantly influences its climate and, consequently, its air quality. Quilengues isn’t located directly adjacent to a major body of water, though it lies within a region drained by tributaries of the Cunene River. The surrounding landscape is characterised by undulating plateaus and scattered hills, transitioning into more arid scrubland further south. While not a heavily industrialised centre, Quilengues serves as a regional trading hub for agricultural produce, particularly maize and beans, grown in the surrounding fertile lands. This agricultural activity contributes to seasonal particulate matter from land preparation and harvesting. The urban-rural gradient is relatively sharp; the city centre is densely populated, while the periphery quickly gives way to farmland and open savannah. Dust from unpaved roads and construction, common in a developing urban area, is a persistent factor. The prevailing winds, influenced by the regional topography, can channel pollutants and dust, impacting air dispersion patterns and creating localised hotspots. The city’s location within a valley can also exacerbate pollution build-up due to limited atmospheric mixing.

Quilengues experiences a distinct wet and dry season, heavily influencing its air quality. The wet season, typically from November to April, brings relief from dust and particulate matter as rainfall effectively suppresses airborne particles. However, increased humidity can also promote the formation of mould spores, potentially impacting respiratory health. The months of January and February generally offer the most favourable conditions for outdoor activity. Conversely, the dry season, spanning May to October, witnesses a significant deterioration in air quality. Strong, dry winds sweep across the plateau, lifting dust from agricultural lands and unpaved roads. This period sees a peak in particulate matter (PM10 and PM2.5) concentrations. August and September are particularly challenging months. Temperature inversions, common during the cooler nights of the dry season, trap pollutants near the ground, exacerbating the problem. Smoke from agricultural burning, used for land clearing, further contributes to pollution during this time. Sensitive groups – children, the elderly, and individuals with pre-existing respiratory conditions – should limit strenuous outdoor activity during the dry season and consider using respiratory protection. Monitoring wind patterns is crucial for predicting pollution events.