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Quelimane, situated in the Zambézia Province of Mozambique, occupies a strategically important position on the Indian Ocean coast, approximately 700 kilometers north of Maputo. The city’s geography is defined by its location within the fertile Zambezi River delta, a low-lying coastal plain characterized by extensive mangrove forests and numerous waterways. Its coordinates, -17.8764, 36.8872, place it within a region experiencing a tropical savanna climate. The terrain is predominantly flat, rarely exceeding 30 meters above sea level, which significantly influences local air circulation patterns. Quelimane’s proximity to the Indian Ocean introduces a maritime influence, moderating temperatures but also contributing to humidity and potential for coastal fog. The surrounding landscape is a mosaic of agricultural land – primarily sugarcane, cotton, and cashew nuts – interspersed with miombo woodlands. This agricultural activity, particularly the burning of vegetation for land clearing, represents a key source of localized air pollution. Further inland, the urban–rural gradient transitions to more extensive woodland and savanna. The Zambezi River itself plays a crucial role, both as a transportation artery and a potential dispersal mechanism for pollutants. The city’s coastal location and flat topography create conditions where pollutants can linger, especially during periods of reduced wind. Industrial activity, though currently limited, is concentrated along the river, adding another layer to the city’s air quality profile. The delta’s complex network of channels and estuaries can trap pollutants, impacting air quality within specific neighborhoods.

Quelimane’s air quality is intrinsically linked to its tropical climate, exhibiting a distinct wet and dry season pattern. The dry season, typically spanning May to October, is characterized by lower rainfall and increased sunshine hours. However, this period often sees a rise in particulate matter pollution. Agricultural burning, a common practice for land preparation, intensifies during this time, releasing significant amounts of smoke and ash into the atmosphere. Reduced rainfall means less atmospheric cleansing, and the relatively stable air masses can lead to stagnant conditions, trapping pollutants near the ground. Temperature inversions, where cooler air settles below warmer air, are also more frequent during the dry season, further exacerbating this issue. The months of July and August are generally considered the most challenging for air quality. Conversely, the wet season (November to April) brings increased rainfall and higher humidity, which naturally washes pollutants from the air. Stronger winds associated with monsoon patterns also help disperse contaminants. Fog, common during the wet season, can temporarily reduce visibility and trap moisture-borne pollutants. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the dry season, limiting outdoor activities during peak burning periods. While the wet season generally improves air quality, periods of heavy rainfall can lead to increased mold and fungal spores, potentially triggering allergic reactions. Maintaining indoor air quality through ventilation and air purification can be beneficial throughout the year, but particularly during the dry season when outdoor pollution levels are elevated.