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Ilafy, a small town nestled within the Toamasina Province of Madagascar, occupies a strategically important coastal position just north of the bustling port city of Toamasina (Tamatave). Located at approximately -17.8919° latitude and 48.4145° longitude, Ilafy’s geography is defined by its proximity to the Indian Ocean and the surrounding low-lying coastal plain. The terrain is generally flat, transitioning gradually to slightly undulating hills further inland, a characteristic of the eastern Madagascar landscape. This flatness, while facilitating development, can also contribute to localized air quality challenges, particularly concerning stagnant air conditions. Ilafy’s urban character is primarily residential, with a developing commercial sector catering to the local population and serving as a satellite community to Toamasina. The surrounding landscape is a mix of small-scale agriculture – primarily vanilla, cloves, and rice cultivation – and pockets of dense coastal forest, vital for biodiversity and local climate regulation. The urban-rural gradient is relatively sharp; the town quickly gives way to agricultural lands and forested areas. The proximity to Toamasina’s industrial zone, though not immediately adjacent, means Ilafy is susceptible to pollutants transported by prevailing winds. The coastal location also introduces the potential for salt spray and marine aerosols, impacting local air composition. The relatively low elevation (generally below 50 meters) limits dispersion of pollutants, especially during periods of calm weather, and the surrounding landscape offers limited natural barriers to air pollution from Toamasina.

Ilafy’s tropical climate dictates a distinct wet and dry season pattern, profoundly influencing 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 removing 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 increased sunshine, but also often by periods of stagnant air. During these months, particularly August and September, the lack of rainfall and reduced wind speeds can lead to a build-up of pollutants originating from Toamasina’s industrial activities and agricultural practices. Temperature inversions, where a layer of warm air traps cooler air near the ground, are more common during the dry season, further hindering pollutant dispersion. Fog, occasionally forming along the coast, can also trap pollutants close to the surface. Agricultural burning, a common practice for land clearing and crop residue disposal, is most prevalent towards the end of the dry season and early in the wet season, contributing significantly to particulate matter pollution. Sensitive groups, including children, the elderly, and individuals with pre-existing respiratory conditions, should exercise caution during the dry season, limiting outdoor activities during periods of stagnant air or visible haze. The transition months (April/May and October/November) generally offer the most favourable air quality, with a balance of rainfall and wind to disperse pollutants, making them ideal times for outdoor pursuits.