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Soavina, nestled within the Antananarivo province of Madagascar, occupies a geographically complex position at approximately -18.9625° latitude and 47.5010° longitude. The city’s location is characterized by a gradual urban–rural gradient, transitioning from a small, densely populated settlement to the surrounding agricultural lands and the foothills of the central highlands. The terrain is gently undulating, typical of the region’s volcanic origins, with elevations ranging from approximately 1200 to 1400 meters above sea level. This altitude influences temperature and atmospheric stability, potentially contributing to localized air quality challenges. Soavina’s proximity to the Itasy River, though not directly adjacent, provides a source of water and influences local humidity. The surrounding landscape is dominated by small-scale agriculture, primarily rice cultivation and maize farming, interspersed with pockets of eucalyptus plantations – a common feature in Madagascar. While Soavina itself lacks significant industrial zones, it’s situated within a broader region experiencing increasing informal sector activity, including brick making and small-scale workshops, which can contribute to localized pollution. The prevailing winds, generally flowing from the east, carry air masses across the agricultural plains, potentially dispersing or concentrating pollutants depending on meteorological conditions. The city’s relatively small size and population (15,658) mean that localized sources, rather than large-scale industrial emissions, are the primary drivers of air quality concerns, with biomass burning from agricultural practices being a significant factor.

Soavina’s tropical highland climate dictates a distinct wet and dry season pattern, profoundly impacting air quality. The dry season, typically spanning from May to October, is characterized by lower rainfall and increased sunshine hours. This period often sees a rise in particulate matter due to agricultural burning practices – farmers clearing fields for the next planting season. The drier air and reduced precipitation limit the natural cleansing effect of rainfall, allowing pollutants to persist longer. Temperature inversions, common during the cooler nights of the dry season, can trap pollutants near the ground, exacerbating localized air quality issues. Conversely, the wet season, from November to April, brings frequent rainfall and higher humidity. This increased precipitation effectively ‘washes’ pollutants from the atmosphere, leading to a noticeable improvement in air quality. However, periods of prolonged fog, particularly during the transition months, can temporarily reduce visibility and trap moisture-borne pollutants. The monsoon winds, though less pronounced than in coastal regions, still influence air movement, potentially dispersing pollutants across a wider area. Outdoor activities are generally more favorable during the wet season, especially during the months of March and April when rainfall is less frequent. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the dry season, particularly during periods of agricultural burning, and avoid prolonged exposure to outdoor air when visibility is reduced due to fog or smoke.