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Andapafito, nestled within the Toamasina Province of Madagascar, occupies a geographically significant position along the eastern coast. Located at approximately -16.9147° latitude and 49.3762° longitude, the town’s immediate surroundings are characterized by a blend of coastal plains and gently undulating terrain, rising gradually inland. The proximity to the Indian Ocean exerts a powerful influence on the local climate and, consequently, air quality. To the east lies the expansive ocean, providing a potential pathway for marine aerosols and influencing prevailing wind patterns. Westward, the landscape transitions into a mosaic of agricultural lands, primarily focused on clove, vanilla, and rice cultivation – key economic drivers for the region. This agricultural belt contributes to potential sources of particulate matter, particularly during harvesting and processing seasons. The urban–rural gradient around Andapafito is relatively smooth; the town itself is small, with a population of around 16,000, and blends seamlessly into the surrounding rural landscape. Elevation is generally low, rarely exceeding 30 meters above sea level, which can exacerbate temperature inversions and trap pollutants close to the ground. The coastal location also means the town is susceptible to sea breezes, which can disperse pollutants but also carry salt spray and marine-derived particles. The lack of significant industrial zones directly within Andapafito mitigates some pollution risks, but transportation corridors connecting Toamasina (Tamatave) and other regional hubs could introduce external pollutants.

Andapafito’s tropical climate dictates a distinct wet and dry season pattern, profoundly impacting air quality throughout the year. The wet season, typically spanning November to April, brings frequent rainfall and high humidity. While the rain naturally helps to cleanse the atmosphere by washing away particulate matter, the increased humidity can also contribute to the formation of secondary pollutants like ozone, particularly during periods of intense sunlight following rainfall. The dry season, from May to October, is characterized by lower rainfall and increased sunshine hours. This often leads to a build-up of pollutants, especially during periods of stagnant air. Temperature inversions, common during the cooler months (June-August), trap pollutants near the ground, worsening air quality. Sea breezes, while generally beneficial for dispersion, can be weaker during these months, further exacerbating the issue. Agricultural activities intensify during the dry season, with burning of crop residues a potential source of smoke and particulate matter. The months of July and August are generally considered the most challenging for air quality, with increased risk for individuals with respiratory conditions. During the wet season, while overall particulate levels may be lower, the high humidity can aggravate asthma and other respiratory ailments. Sensitive groups, including children, the elderly, and those with pre-existing respiratory or cardiovascular conditions, should exercise caution during periods of stagnant air and intense agricultural activity, regardless of the season. Maintaining indoor air quality through ventilation and air purification can offer some protection.