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Cuamba, nestled in the Niassa Province of Mozambique, occupies a significant, yet often overlooked, position within the country’s northern interior. Located at approximately -14.8200 latitude and 36.5486 longitude, the city sits on a plateau, roughly 700-800 meters above sea level. This elevation moderates temperatures but also contributes to the potential for temperature inversions, trapping pollutants closer to the ground. The surrounding landscape is characterised by miombo woodland, a vast expanse of savanna dotted with Brachystegia trees, transitioning into more rugged terrain further west towards the highlands. Cuamba’s air quality is intrinsically linked to this environment; seasonal burning for agricultural land preparation is a major factor. The city itself is a regional trading hub, serving the surrounding agricultural areas, primarily focused on maize, cassava, and cotton. While not heavily industrialised, small-scale processing of agricultural products and the presence of vehicle traffic contribute to localised pollution. The urban-rural gradient is relatively sharp, with a rapid transition from the town’s centre to rural farmland. The lack of significant water bodies immediately adjacent to Cuamba means limited natural dispersion of pollutants, making the city more vulnerable to air quality issues during periods of stagnant air.

Cuamba experiences a distinct wet and dry season, heavily influencing its air quality. The dry season, from May to October, is typically associated with poorer air quality. This is primarily due to increased agricultural burning to clear land for planting, releasing substantial particulate matter (PM2.5 and PM10) into the atmosphere. The drier air also means less atmospheric cleansing, and dust from unpaved roads becomes more prevalent. November marks the beginning of the wet season, bringing relief from the dust and smoke. Rainfall washes pollutants from the air, and vegetation growth reduces the need for burning. However, the wet season (November to April) isn’t without its challenges. Increased humidity can promote mould growth, impacting respiratory health. February and March often see the heaviest rainfall, offering the cleanest air. Temperature inversions, common during cooler nights throughout the year, can exacerbate pollution events, trapping pollutants near ground level. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit outdoor activity during the peak of the dry season (August-September) and be mindful of indoor air quality during periods of high humidity. Monitoring wind patterns is crucial; winds from agricultural areas during burning season will carry pollutants directly into the city.