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Antanimenabaka, nestled within the Toamasina Province of Madagascar, occupies a geographically significant position along the eastern coast. Located at approximately -16.9373° latitude and 48.4913° longitude, the town’s immediate surroundings are characterized by a blend of coastal plains and gently undulating terrain. The proximity to the Indian Ocean exerts a powerful influence on the local climate and, consequently, air quality. The landscape transitions rapidly from sandy beaches and mangrove forests to a backdrop of low hills and agricultural land, creating a distinct urban–rural gradient. Toamasina, Madagascar’s primary port city, lies a relatively short distance to the north, and its industrial activities, including processing of agricultural products like vanilla and cloves, contribute to regional air pollution patterns. The surrounding area is predominantly agricultural, with rice paddies and small-scale farming dominating the landscape. This agricultural activity, while vital to the local economy, can introduce particulate matter into the air, particularly during harvesting and burning seasons. The elevation of Antanimenabaka itself is relatively low, minimizing the potential for significant vertical mixing of air pollutants. The prevailing easterly trade winds, common along Madagascar’s east coast, play a crucial role in dispersing pollutants, but can also concentrate them under certain meteorological conditions. The town’s location within a humid tropical climate further influences air quality, with high humidity often trapping pollutants near the surface. The coastal location also means that sea breezes can significantly impact local air movement and pollutant distribution.

Antanimenabaka experiences a tropical climate with distinct wet and dry seasons, profoundly impacting its air quality profile. The wet season, typically spanning from November to April, brings frequent rainfall and high humidity. While the rain helps to cleanse the atmosphere by removing particulate matter, the increased humidity can trap gaseous pollutants closer to the ground, particularly during periods of reduced wind. The dry season, from May to October, is characterized by lower rainfall and generally clearer skies. However, this period often sees a rise in air pollution due to increased agricultural burning, a common practice for land clearing and crop residue disposal. The lack of rainfall during these months means fewer opportunities for pollutant washout. Temperature inversions, though less frequent than in temperate climates, can occasionally occur, trapping pollutants in a layer near the surface, exacerbating respiratory issues. Months like August and September, coinciding with peak agricultural burning, are generally periods to avoid strenuous outdoor activity, especially for vulnerable populations like children and the elderly. The prevailing easterly trade winds usually provide some degree of ventilation, but their strength can vary considerably. Fog, though not a frequent occurrence, can significantly reduce visibility and trap pollutants during the cooler months. During the wet season, individuals with respiratory conditions should be mindful of increased humidity, which can trigger asthma or other breathing difficulties. Protective measures, such as indoor air purification and limiting exposure to outdoor pollutants, are advisable during periods of high humidity and agricultural burning.