Ankilivalo, nestled within the Toliara region of Madagascar, occupies a unique coastal position on the Mozambique Channel. Its coordinates, -20.2984, 44.6361, place it within a predominantly low-lying landscape, characterized by sandy plains and gently sloping terrain that gradually rises towards the interior highlands. The city’s immediate surroundings are dominated by the expansive coastal scrub and sparse vegetation typical of the spiny forest ecoregion, a biome uniquely adapted to arid conditions. The proximity to the Mozambique Channel exerts a significant influence on local weather patterns and, consequently, air quality. The channel’s prevailing winds often bring maritime air masses, which can both dilute pollutants and, under certain conditions, trap them. Ankilivalo’s relatively small population of 13,000 suggests a primarily rural character, with a gradual urban–rural gradient extending outwards. While industrial activity is limited within the city itself, the broader Toliara region supports some agricultural zones, primarily focused on vanilla, cloves, and cassava cultivation. These agricultural practices, particularly if employing burning techniques for land clearing or crop residue disposal, can contribute to localized air pollution events. The lack of significant industrial belts directly adjacent to Ankilivalo mitigates some pollution risks, but the coastal location and surrounding vegetation still play a crucial role in the city’s air quality dynamics. The elevation, generally below 50 meters, contributes to potential temperature inversions, especially during cooler months, which can trap pollutants near the ground.

Ankilivalo’s tropical climate dictates a distinct wet and dry season pattern, profoundly impacting air quality. The dry season, typically spanning from May to October, is characterized by consistently high temperatures and reduced rainfall. This period often sees a build-up of particulate matter due to reduced precipitation to wash pollutants from the atmosphere and increased dust lifted by prevailing winds. The lack of cloud cover also intensifies solar radiation, potentially contributing to photochemical smog formation, although this is likely limited by the absence of significant industrial emissions. During this time, stagnant air masses can develop, particularly during periods of high pressure, leading to localized pollution episodes. The wet season, from November to April, brings increased rainfall and higher humidity. These conditions generally improve air quality by removing particulate matter and diluting gaseous pollutants. However, heavy rainfall events can occasionally lead to increased fungal spores and mold, impacting air quality for sensitive individuals. Fog, a relatively infrequent occurrence, can trap pollutants close to the ground, creating temporary pockets of poor air quality. The months of July and August, within the dry season, are generally considered periods to exercise caution for those with respiratory sensitivities. Conversely, February and March, during the peak of the wet season, typically offer the best air quality. Individuals with asthma, allergies, or other respiratory conditions should monitor local conditions and limit outdoor exposure during periods of stagnant air or increased dust.