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Mahaly, a coastal city in the Toliara Province of Madagascar, occupies a unique geographic position. Situated at -24.1733 latitude and 46.3495 longitude, the city is nestled along the Mozambique Channel, benefitting from a direct interface with the Indian Ocean. The terrain is generally flat, characteristic of the coastal plains of southwestern Madagascar, with a gradual rise inland. This flatness contributes to limited natural dispersion of pollutants. The population of approximately 15,197 is concentrated around the port, which is the city’s economic engine. Surrounding Mahaly are vast expanses of spiny forest, a distinctive ecoregion of southern Madagascar, and agricultural lands primarily dedicated to subsistence farming, including cassava and maize. The urban-rural gradient is relatively sharp; the city itself is compact, quickly transitioning to rural landscapes. The port activity, handling both import and export goods, introduces potential sources of particulate matter and other emissions. Dust from unpaved roads and construction, coupled with seasonal bush fires in the surrounding spiny forest, further contribute to localized air quality challenges. The coastal location means sea breezes can offer some relief, but also potentially transport pollutants inland depending on prevailing wind directions. The lack of significant industrial belts *within* Mahaly shifts the focus to port-related and domestic fuel combustion as primary concerns.

Mahaly experiences a distinct tropical climate with a pronounced wet and dry season, heavily influencing air quality. The dry season, roughly from April to November, is characterized by strong south-easterly trade winds that can carry dust from the interior and exacerbate particulate matter concentrations. This is typically when air quality is poorest, particularly during periods of increased port activity and agricultural burning. November to March brings the wet season, with monsoon rains offering a natural cleansing effect, washing away dust and suppressing wildfires. However, increased humidity can also promote mold growth, potentially impacting respiratory health. Temperature inversions, though less frequent than in temperate climates, can occur during calmer periods within the dry season, trapping pollutants near ground level. Sensitive individuals, including children and those with pre-existing respiratory conditions, should limit strenuous outdoor activity during the drier months, especially when winds are strong. The months of January and February, coinciding with peak rainfall, generally offer the most favourable air quality conditions. Monitoring wind direction is crucial; winds from inland areas during the dry season are likely to bring higher levels of dust and smoke. Localized smoke from cooking fires is a year-round concern, particularly in densely populated areas.