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Caxito, the provincial capital of Bengo, Angola, occupies a geographically significant position approximately 70 kilometers northeast of Luanda. Situated at coordinates -8.5800, 13.6642, the city lies within a relatively flat coastal plain, gently rising inland. This terrain is characteristic of the Bengo province, a transition zone between the Atlantic Ocean and the inland plateaus. The surrounding landscape is dominated by dense tropical rainforest and agricultural lands, particularly palm oil and banana plantations, which contribute significantly to the local economy. Caxito’s proximity to the Caxito River, a vital waterway, influences local humidity and potentially contributes to localised pollutant dispersion. The urban-rural gradient is pronounced; the city centre is increasingly dense, while the periphery quickly transitions into rural agricultural areas. This rapid urbanisation, coupled with limited infrastructure, presents challenges for air quality management. Dust from unpaved roads and construction, alongside emissions from vehicle traffic and small-scale industries processing agricultural products, are key contributors to particulate matter. The prevailing winds, generally from the Atlantic, can transport marine aerosols inland, impacting air composition. The lack of significant industrial belts *within* Caxito itself means pollution sources are more dispersed, but still concentrated around market areas and transport hubs.

Caxito experiences a distinct tropical climate with a pronounced wet and dry season, rather than traditional four seasons. Air quality in Caxito is heavily influenced by these seasonal shifts. The dry season, typically from May to September, sees a significant increase in particulate matter. Reduced rainfall means less atmospheric cleansing, and increased dust from unpaved roads and agricultural activities becomes more prevalent. Harmattan winds, carrying Saharan dust, can exacerbate this issue, impacting visibility and respiratory health. October to April marks the wet season, bringing relief from dust but also increasing humidity. While rainfall washes away some pollutants, stagnant air and increased fungal spores can create indoor air quality concerns. Temperature inversions, common during the cooler, drier months of July and August, trap pollutants near ground level. November and December often experience localised flooding, potentially releasing contaminants from stagnant water. For sensitive groups – children, the elderly, and those with respiratory conditions – avoiding outdoor activity during peak dust periods (June-August) is advisable. Monitoring local weather patterns and staying indoors during periods of high humidity or dust storms is crucial for protecting respiratory health.