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Mangabe, nestled within the Toamasina Province of Madagascar, occupies a geographically significant position on the eastern coast. Located at approximately -16.9202 latitude and 49.4476 longitude, the town’s setting is characterized by a gently sloping terrain transitioning from the coastal lowlands towards the Analamanga Massif, a range of hills that define the region’s interior. This proximity to both the Indian Ocean and the rising terrain creates a complex interplay of factors influencing air quality. The surrounding landscape is a mosaic of coastal scrubland, small-scale agricultural plots – primarily focused on rice cultivation and vanilla production – and patches of remnant rainforest. The urban–rural gradient is relatively sharp; Mangabe itself is a small, primarily rural settlement, with agricultural activities dominating the immediate periphery. Further inland, the terrain becomes steeper, and the vegetation denser. The town’s location near the coast means it is susceptible to maritime influences, including sea breezes and occasional salt spray. While Mangabe lacks large-scale industrial zones within its immediate vicinity, it benefits from its proximity to Toamasina, Madagascar’s primary port city, which introduces potential for trans-boundary pollution transport. The elevation, though modest, contributes to localized air circulation patterns, potentially trapping pollutants under certain meteorological conditions. The surrounding agricultural practices, including burning of vegetation for land clearing, can also contribute to localized air pollution episodes.

Mangabe’s tropical climate dictates a distinct wet and dry season pattern, profoundly impacting air quality. The wet season, typically spanning from November to April, brings frequent rainfall and high humidity. While the rain naturally helps to cleanse the atmosphere, reducing particulate matter, the increased humidity can exacerbate respiratory issues for sensitive individuals. The dry season, from May to October, is characterized by lower rainfall and increased sunshine. During this period, particularly in August and September, a tendency for temperature inversions can occur, trapping pollutants closer to the ground. These inversions are linked to calmer wind conditions and cooler nighttime temperatures, which lead to a stable atmospheric layer preventing vertical mixing. Agricultural burning, a common practice during land preparation for the planting season (often coinciding with the transition from dry to wet season), significantly contributes to elevated levels of smoke and particulate matter. Fog, more prevalent during the cooler months of the dry season, can also trap pollutants, reducing visibility and impacting air quality. Sensitive groups, including children, the elderly, and individuals with pre-existing respiratory conditions, should exercise caution during periods of agricultural burning and when fog or temperature inversions are observed. Outdoor activities are generally more favourable during the wetter months, although humidity can still pose a challenge. The transition months, particularly October and November, often experience a combination of agricultural burning and shifting weather patterns, presenting a period of heightened air quality concerns.