Beantake, nestled within the Toliara region of southwestern Madagascar, occupies a unique and vulnerable geographic position. Located at approximately -23.8003° latitude and 44.3078° longitude, the town sits on a coastal plain, gently sloping towards the Mozambique Channel. This proximity to the Indian Ocean significantly influences local climate and, consequently, air quality. The surrounding landscape is characterized by a mosaic of spiny forest, a biodiversity hotspot unique to Madagascar, interspersed with pockets of agricultural land primarily dedicated to vanilla, cloves, and rice cultivation. The urban–rural gradient transitions rapidly from Beantake’s modest settlement to the extensive, sparsely populated spiny forest, creating a buffer zone that can, at times, mitigate the impact of localized pollution. Elevation is minimal, rarely exceeding 30 meters above sea level, which limits atmospheric dispersion of pollutants. While Beantake itself lacks significant industrial belts, the broader Toliara region experiences some processing of agricultural products, and occasional wood burning for cooking and heating contributes to localized emissions. Prevailing winds generally blow from the east, carrying moisture from the Mozambique Channel, but their strength and direction can vary considerably, impacting the dispersal of any pollutants generated within the town or transported from nearby agricultural areas. The relatively flat terrain and coastal location make Beantake susceptible to sea breezes and potential salt spray, which can interact with other airborne particles.

Beantake’s tropical climate dictates a distinct wet and dry season, profoundly influencing air quality patterns. 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 exacerbate respiratory issues for sensitive individuals. The dry season, from May to October, is characterized by lower rainfall and higher temperatures. During this period, the lack of rain allows dust and particulate matter from agricultural activities and unpaved roads to accumulate. Stagnant air conditions are more common during the dry season, particularly in the mornings, potentially leading to localized concentrations of pollutants. Temperature inversions, where a layer of warm air traps cooler air near the ground, can occasionally occur, further hindering vertical mixing and trapping pollutants. The prevailing easterly winds, while generally beneficial for dispersal, can sometimes become weak or reverse direction, leading to periods of poor air quality. Mornings during the dry season often experience a slight haze due to dew and residual dust. Individuals with respiratory conditions, young children, and the elderly should exercise caution during these periods, limiting strenuous outdoor activity and ensuring adequate ventilation. The transition months (April/May and October/November) typically offer the most favourable air quality, with a balance of rainfall and wind to disperse pollutants, making them ideal times for outdoor pursuits.