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Andreba, nestled within the Mahajanga Province of Madagascar, occupies a unique geographic position that significantly influences its air quality. Located at approximately -14.5971° latitude and 48.1881° longitude, the town sits on a gently sloping coastal plain, bordering the Mozambique Channel. This proximity to the Indian Ocean introduces a constant maritime influence, generally moderating temperatures and providing a source of sea breezes. The surrounding landscape is characterized by a mosaic of coastal scrubland, interspersed with small-scale agricultural plots – primarily rice paddies and cassava farms – and pockets of dense, deciduous forest further inland. The urban–rural gradient is relatively sharp; Andreba transitions quickly from a small settlement to agricultural land, with limited extensive industrial zones nearby. The elevation is low, rarely exceeding 30 meters above sea level, which can exacerbate the trapping of pollutants under certain meteorological conditions. While there are no major industrial belts directly adjacent to Andreba, the regional capital, Mahajanga, lies approximately 150km to the north, and occasional transport of pollutants from that area is possible via prevailing winds. The terrain’s flatness limits vertical mixing, potentially leading to ground-level accumulation of particulate matter, particularly during periods of stagnant air. The region’s climate is tropical, with a distinct wet and dry season, a factor that profoundly impacts local air quality dynamics.

Andreba’s air quality follows a predictable seasonal pattern dictated by its tropical climate. The wet season, typically spanning from November to April, brings frequent rainfall and high humidity, generally leading to improved air quality as precipitation washes away particulate matter and dilutes gaseous pollutants. However, periods of intense rainfall can also lead to increased fungal spore counts, impacting respiratory health for sensitive individuals. The dry season, from May to October, presents a different challenge. Reduced rainfall and lower humidity contribute to a build-up of dust and particulate matter, especially during periods of land clearing for agriculture or minor construction activities. The lack of consistent rainfall means pollutants linger longer. Temperature inversions, common during the cooler months (July-August), can trap pollutants near the ground, creating localized pockets of poorer air quality. Sea breezes, while generally beneficial, can sometimes carry dust and salt from the Mozambique Channel, particularly during windy periods. Fog, occasionally occurring during the dry season, further reduces visibility and can concentrate pollutants. During the transition months (April/May and October/November), unpredictable weather patterns can lead to fluctuating air quality. Sensitive groups, including children, the elderly, and individuals with pre-existing respiratory conditions, should exercise caution during the dry season, particularly during periods of stagnant air or dust storms. Outdoor activities are generally more favourable during the wet season, but awareness of potential fungal spore exposure is advisable.