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Vohipeno, nestled within the Toamasina Province of Madagascar, occupies a geographically significant position along the eastern coast. Located at approximately -17.1648° latitude and 49.2943° longitude, the city’s terrain is characterized by a gently sloping coastal plain, transitioning inland to low hills and eventually the highlands. This coastal location directly influences its air quality, bringing in maritime breezes that can both disperse and, under certain conditions, trap pollutants. The surrounding landscape is a mosaic of coastal forests, small-scale agriculture (primarily rice cultivation and vanilla farming), and pockets of mangrove ecosystems along the shoreline. Toamasina, Madagascar’s largest port city, lies approximately 80 kilometers north, representing a potential source of industrial emissions and shipping-related air pollution that can be transported southward by prevailing winds. The urban–rural gradient around Vohipeno is relatively gradual; the city blends seamlessly into the agricultural landscape, with small villages and farms dotting the periphery. The proximity to the Indian Ocean moderates temperatures, but also introduces salt aerosols into the atmosphere. The elevation is relatively low, generally below 100 meters above sea level, which can exacerbate temperature inversions, particularly during the drier months, hindering vertical mixing of air pollutants. The region’s geology, composed primarily of sedimentary rocks, doesn't contribute significantly to air pollution, but the soil composition can influence dust levels during dry periods. The presence of small-scale brick kilns and wood-fired cooking stoves within and around Vohipeno contribute to localized particulate matter pollution.

Vohipeno’s tropical climate dictates a distinct wet and dry season pattern, profoundly impacting its air quality. The wet season, typically spanning November to April, brings frequent rainfall and high humidity. While the rain naturally helps to cleanse the atmosphere by scavenging pollutants, the increased humidity can also lead to the formation of secondary pollutants like ozone under specific conditions. The prevailing winds during this period are generally from the east, bringing moisture-laden air from the Indian Ocean, which can temporarily reduce particulate matter concentrations. Conversely, the dry season (May to October) presents a greater air quality challenge. Reduced rainfall means fewer opportunities for atmospheric cleansing, and the drier air allows dust and particulate matter to remain suspended for longer periods. Temperature inversions are more common during this time, particularly in the mornings, trapping pollutants close to the ground. Fog, which occasionally forms along the coast, further exacerbates this issue by limiting dispersion. Months like July and August often experience the poorest air quality due to a combination of these factors. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should limit prolonged outdoor activity during these periods, especially during early morning hours. The burning of agricultural waste after the harvest season, typically in September and October, contributes significantly to localized smoke and particulate matter pollution. During the wet season, increased mould and mildew growth can trigger respiratory sensitivities in some individuals, necessitating indoor air quality precautions.