Sendrisoa Air Quality Index (AQI)

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Sendrisoa, nestled within the Fianarantsoa province of Madagascar, occupies a challenging geographical position in the central highlands. Located at approximately -22.0030 latitude and 46.9529 longitude, the city sits at a considerable elevation, contributing to cooler temperatures than the coastal regions. The surrounding landscape is characterised by rolling hills and steep slopes, typical of the region’s eroded sandstone formations. This terrain significantly influences air quality, limiting atmospheric dispersion of pollutants. The city isn’t directly adjacent to a major body of water, though smaller rivers and streams dissect the landscape, potentially acting as pollutant conduits during heavy rainfall. While Sendrisoa isn’t a heavily industrialised centre, the surrounding Fianarantsoa region supports significant agricultural activity, particularly rice cultivation and vanilla farming. This agricultural land use introduces potential sources of particulate matter from field preparation, burning of agricultural waste, and fertiliser application. The urban-rural gradient is relatively sharp; the city centre quickly transitions to rural farmland and forested hillsides. This proximity to agricultural sources, combined with the topographic constraints, creates a localised air quality profile distinct from larger, more industrialised Malagasy cities. The prevailing winds, influenced by the highland topography, play a crucial role in pollutant transport and concentration within the urban area.

Sendrisoa experiences a distinct wet and dry season, heavily influencing its air quality. The dry season, roughly from May to October, sees a significant increase in particulate matter. Reduced rainfall means less atmospheric cleansing, and agricultural burning for land preparation becomes more prevalent, releasing smoke and ash. Dust from unpaved roads also contributes to poorer air quality during this period. November marks the transition, with sporadic rainfall offering temporary relief. The wet season, from November to April, generally brings improved air quality. Frequent rainfall effectively washes pollutants from the atmosphere, and increased humidity suppresses dust. However, the wet season can also lead to localised flooding, potentially mobilising pollutants from agricultural runoff. January and February, the peak of the rainy season, are typically the most favourable months for outdoor activity. Temperature inversions, common during the cooler dry season mornings, can trap pollutants near ground level, exacerbating conditions. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit strenuous outdoor activity during the dry season, particularly on calm, clear days. Monitoring wind patterns is crucial, as pollutants can accumulate quickly in valleys and depressions.