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Macomia, nestled within the Cabo Delgado province of Mozambique, occupies a geographically significant position along the Indian Ocean coastline. Its coordinates, -12.2467, 40.1208, place it within a region characterized by a complex interplay of coastal plains, riverine systems, and gently undulating terrain. The city itself is situated relatively close to the Quirimbas Archipelago, a chain of islands that influence local weather patterns and sea breezes. Macomia’s landscape is dominated by sandy soils and sparse vegetation, typical of the coastal belt, transitioning gradually into more dense woodland and scrubland further inland. The surrounding area is a mosaic of agricultural land, primarily focused on cashew nut cultivation and small-scale farming, interspersed with mangrove forests and coastal wetlands. This agricultural activity, while vital to the local economy, can contribute to localized air pollution through the burning of agricultural waste and the use of fertilizers. The urban–rural gradient around Macomia is relatively gradual, with small villages and settlements blending seamlessly into the broader rural landscape. Elevation is generally low, rarely exceeding 30 meters above sea level, which can exacerbate the trapping of pollutants, particularly during periods of calm weather. The proximity to the Indian Ocean introduces a constant source of sea salt aerosols, which, while a natural component of the atmosphere, can interact with other pollutants and affect respiratory health. The lack of significant industrial belts within immediate proximity mitigates some pollution risks, but the reliance on biomass for cooking and heating in many households remains a key factor influencing local air quality.

Macomia’s tropical climate dictates a distinct wet and dry season pattern, profoundly influencing its air quality. The dry season, typically spanning from May to October, is characterized by reduced rainfall and increased sunshine hours. However, this period often sees a build-up of pollutants due to decreased atmospheric mixing. Calm wind conditions are more frequent, leading to potential temperature inversions where cooler, denser air becomes trapped beneath a layer of warmer air, preventing pollutants from dispersing. Agricultural burning, a common practice for land clearing and waste disposal, intensifies during this time, releasing particulate matter and other harmful gases. The months of July and August are particularly susceptible to these conditions, making outdoor activities potentially challenging for sensitive individuals. Conversely, the wet season, from November to April, brings frequent rainfall and higher humidity. These conditions naturally cleanse the atmosphere, washing away particulate matter and diluting gaseous pollutants. Stronger winds associated with monsoon patterns also aid in dispersion. Fog, which can occasionally form during the transition periods between seasons, can temporarily reduce visibility and trap pollutants near the ground. During the wet season, respiratory illnesses may be linked to increased humidity and fungal growth rather than directly to air pollution. Sensitive groups, including children, the elderly, and those with pre-existing respiratory conditions, should exercise caution during the dry season, limiting prolonged outdoor exposure and avoiding areas with visible smoke. Maintaining good ventilation indoors is also crucial during this period.