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Mussende, nestled in the Cuanza-Sul province of Angola, occupies a geographically significant position within a transitional landscape. Located at approximately -10.5103 latitude and 16.0107 longitude, the city sits at an elevation that allows for a moderate climate, though its proximity to the Atlantic coast exerts a considerable influence. The surrounding terrain is characterized by a gradual shift from coastal plains to a gently undulating plateau, typical of the Angolan highlands. This topography plays a crucial role in air circulation patterns; stagnant air can accumulate in localized depressions, particularly during periods of low wind. The city’s urban fabric is relatively compact, reflecting its historical development as a regional administrative and trading center. While primarily urban, Mussende is surrounded by a mosaic of small-scale agricultural plots and subsistence farms, contributing to localized dust and biomass burning during agricultural cycles. Further afield, the landscape transitions into more extensive savannah and woodland, influencing regional wind patterns and potential sources of particulate matter. The Cuanza River, though not directly adjacent, flows within reasonable proximity, impacting humidity levels and potentially influencing the dispersion of pollutants. The urban–rural gradient around Mussende is relatively smooth, with agricultural activities gradually blending into the urban periphery. Industrial activity is limited, primarily focused on small-scale processing of agricultural products, but the potential for future expansion and associated air quality impacts remains a consideration. The prevailing winds generally blow from the southeast, carrying potential pollutants from inland areas.

Mussende experiences a tropical savanna climate, characterized by distinct wet and dry seasons rather than the four traditional seasons. The dry season, typically spanning from May to October, presents the most significant air quality challenges. Reduced rainfall leads to drier soils, increasing the prevalence of windblown dust, a major contributor to particulate matter. Agricultural burning, a common practice for land clearing and crop residue disposal, intensifies during this period, releasing significant amounts of smoke and pollutants. Temperature inversions, where cooler air becomes trapped beneath a layer of warmer air, are more frequent during the dry season, hindering vertical mixing and concentrating pollutants near ground level. The wet season, from November to April, brings increased rainfall and higher humidity, which naturally scavenges pollutants from the atmosphere, leading to improved air quality. However, heavy rainfall events can also mobilize dust and contribute to localized flooding, potentially releasing contaminants. Fog, though infrequent, can occur during the cooler months, trapping pollutants and reducing visibility. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the dry season, particularly during periods of agricultural burning or dust storms. Limiting outdoor exertion and wearing masks can help mitigate exposure. The transition periods between wet and dry seasons often see fluctuating air quality, influenced by shifting wind patterns and varying levels of agricultural activity. Maintaining awareness of local conditions and adhering to public health advisories is crucial for protecting respiratory health.