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Ikongo, nestled within the Fianarantsoa region of Madagascar, presents a unique geographic context influencing its air quality. Situated at approximately -21.8789 latitude and 47.4350 longitude, the city occupies a highland plateau environment. The terrain is characterised by rolling hills and valleys, typical of the central highlands, with an elevation contributing to cooler temperatures compared to coastal regions. Ikongo isn’t directly adjacent to major bodies of water, though numerous smaller rivers and streams dissect the landscape, originating from the surrounding highlands. The urban character is predominantly rural, with a strong agricultural base. Rice paddies and small-scale farming dominate the surrounding areas, alongside some subsistence forestry. This agricultural activity, while vital to the local economy, contributes to particulate matter through land clearing and seasonal burning. The urban-rural gradient is relatively sharp; the city centre is compact, quickly transitioning to agricultural land. The lack of significant industrial belts within Ikongo itself is a mitigating factor, but regional transport routes passing through can introduce vehicle emissions. The prevailing winds, influenced by the island’s topography, play a crucial role in dispersing or concentrating pollutants, particularly during calmer periods. The city’s location within a valley can also exacerbate pollution build-up due to limited atmospheric mixing.

Ikongo experiences a distinct tropical highland climate, broadly defined by a wet season (November to April) and a dry season (May to October). Air quality generally deteriorates during the dry season. Reduced rainfall means less atmospheric cleansing, allowing particulate matter from agricultural burning – a common practice for land preparation – to accumulate. The dry air also facilitates the suspension of dust from unpaved roads, prevalent throughout the region. Temperature inversions, common during the cooler nights of the dry season, trap pollutants near ground level. The wet season offers a reprieve, with frequent rainfall effectively washing away airborne particles. However, even during the wet season, localised pollution can occur from biomass burning for cooking and heating. Months like August and September are typically the most challenging for respiratory health due to the peak of dry season conditions. Conversely, February and March, during the height of the wet season, generally offer the best air quality. Sensitive groups – children, the elderly, and those with pre-existing respiratory conditions – should limit strenuous outdoor activity during the dry season and consider using masks when dust levels are high. Monitoring local fire activity is also advisable.