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Mahatalaky is a coastal settlement situated in the Toliara region of southwestern Madagascar, where the land meets the turquoise waters of the Mozambique Channel. The urban character is defined by a low-density, sprawling layout typical of rural Malagasy administrative centers, characterized by sandy streets and traditional architecture. Geographically, the town sits on a flat, semi-arid coastal plain where the terrain is predominantly composed of calcareous sands and scrubby vegetation. This specific positioning creates a unique atmospheric dynamic; the proximity to the ocean ensures a consistent influx of maritime air, which generally helps to disperse pollutants. However, the surrounding landscape is an expansive zone of dry forests and agricultural plots, where the urban–rural gradient is blurred. Air quality is heavily influenced by the aeolian transport of fine mineral dust from the arid hinterlands, which often blankets the town during dry spells. While there are no heavy industrial belts, the regional economy relies on small-scale fishing and subsistence farming, meaning the primary pollution sources are localized. The lack of significant topographic barriers allows sea breezes to penetrate inland, yet during periods of atmospheric stability, particulate matter from biomass burning—used for cooking and land clearing—can linger near the ground. The elevation is minimal, keeping the town susceptible to coastal humidity, which can trap aerosols during the cooler nights, creating a subtle but noticeable haze that characterizes the regional atmospheric profile. This delicate balance between the cleaning effect of the Mozambique Channel and the dust-laden winds from the interior defines the town's overall air quality.

In Mahatalaky, air quality fluctuates primarily between the dominant dry and wet seasons. During the dry season, spanning from May to October, pollution typically peaks due to the combination of arid conditions and the prevalence of aeolian dust. Stronger winds from the interior transport fine mineral particulates across the coastal plain, while the practice of slash-and-burn agriculture leads to intermittent spikes in smoke and particulate matter. Temperature inversions during the cooler winter months can occasionally trap these pollutants close to the surface, making the air feel heavy and irritating. Conversely, the wet season, running from November to April, brings a significant improvement in air clarity. Frequent tropical rains act as a natural scrubbing mechanism, washing particulate matter and aerosols from the atmosphere. The increased humidity and shifting wind patterns, influenced by the monsoon-like cycles of the Indian Ocean, facilitate the dispersal of pollutants. For sensitive groups, including children and the elderly, the months of August and September are the most challenging, as dust levels are often at their highest. During these periods, reducing outdoor activities during peak wind events and using simple fabric masks can mitigate respiratory distress. The wet season is generally the most favorable time for outdoor activity, although the high humidity can exacerbate certain asthma conditions. By understanding these meteorological cycles, residents and visitors can better navigate the seasonal respiratory risks inherent to this semi-arid coastal environment. This cyclical nature means that air quality is rarely static, shifting with the winds and the arrival of the rainy season.