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Zumbo, a town nestled in the Tete Province of Mozambique, occupies a geographically significant position at the confluence of the Zambezi and Mucozi rivers, close to the border with Zambia. Its coordinates, -15.6148, 30.4440, place it within a vast, relatively flat floodplain characterized by alluvial soils. The surrounding landscape is dominated by the Zambezi River basin, a sprawling expanse of savanna grasslands, miombo woodlands, and riparian forests. Elevation is generally low, rarely exceeding 100 meters above sea level, contributing to a stable atmospheric layer that can, under certain conditions, trap pollutants. Zumbo’s location within a major river system influences local humidity and temperature, impacting atmospheric stability. The town’s urban character is primarily that of a trading hub and agricultural service center, with a gradual urban–rural gradient extending outwards into the surrounding agricultural lands, where maize, cassava, and cotton are cultivated. While Zumbo itself lacks significant heavy industry, its proximity to Tete’s coal mining region, approximately 200km to the north, introduces a potential source of airborne particulate matter transported by prevailing winds. The Mucozi River’s influence creates localized microclimates, and the extensive floodplain can experience seasonal flooding, which can temporarily redistribute pollutants and affect air quality through resuspension of sediments. The relatively open terrain allows for good ventilation in some directions, but also facilitates the long-range transport of dust and smoke from regional agricultural burning practices.

Zumbo’s tropical climate dictates a distinct wet and dry season pattern, profoundly influencing its air quality. The dry season, typically spanning May to October, is characterized by lower rainfall and increased temperatures. This period often sees a rise in particulate matter concentrations due to agricultural burning practices employed for land clearing and crop residue disposal. The drier air and reduced precipitation limit the natural cleansing effect of rainfall, allowing pollutants to persist longer. Temperature inversions, where a layer of warm air sits above cooler air near the ground, are more frequent during the dry season, trapping pollutants close to the surface, particularly during the cooler mornings. The prevailing winds, generally from the southeast, can transport dust and smoke from agricultural areas to the north and west of Zumbo. The wet season, from November to April, brings increased rainfall and higher humidity, which generally improves air quality by washing pollutants from the atmosphere. However, intense rainfall events can also lead to temporary increases in particulate matter as floodwaters resuspend sediments. Fog, common during the wet season, can also trap pollutants, creating localized pockets of poor air quality. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the dry season, particularly in the months of July and August, and avoid prolonged outdoor activity during periods of visible smoke or haze. During the wet season, be mindful of potential respiratory irritation from damp conditions and flood-related contaminants.