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Sahavato, nestled within the Fianarantsoa province of Madagascar, occupies a challenging geographical position in the central highlands. Located at approximately -20.5968 latitude and 48.3245 longitude, the city sits at an elevation of roughly 850 meters above sea level, contributing to cooler temperatures than coastal regions. The surrounding landscape is characterised by rolling hills and steep valleys, typical of Madagascar’s interior. This terrain significantly influences air quality, creating localized pockets of stagnant air where pollutants can accumulate. Sahavato isn’t directly adjacent to major bodies of water, though smaller rivers and streams dissect the region, providing limited natural dispersion. The urban-rural gradient is relatively sharp; the city itself is compact, with a population of around 28,000, quickly transitioning to agricultural land dominated by rice paddies and small-scale farming. While Sahavato lacks heavy industry, the widespread use of wood and charcoal for cooking and heating, coupled with dust from unpaved roads and agricultural practices, are primary contributors to particulate matter. The city’s position within a valley can exacerbate pollution during temperature inversions, trapping emissions near ground level. The prevailing winds, influenced by the island’s orography, play a crucial role in pollutant dispersal, though their effectiveness is limited by the topography.

Sahavato experiences a distinct wet and dry season, heavily influencing its air quality. The dry season, from April to October, is typically associated with poorer air quality. Reduced rainfall means less atmospheric cleansing, and increased reliance on wood and charcoal for cooking during cooler evenings leads to higher particulate matter concentrations. Dust from agricultural activities and unpaved roads also becomes more prominent. August and September are often the months with the most noticeable haze. Conversely, the wet season, from November to March, brings significant improvements in air quality. Frequent rainfall effectively washes pollutants from the atmosphere, and increased humidity can suppress dust. However, the wet season can also bring localised flooding, potentially mobilising pollutants from contaminated areas. Temperature inversions, common during the cooler dry season mornings, trap pollutants near ground level, worsening conditions. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit outdoor activity during the dry season, particularly in the early mornings and evenings. Monitoring wind patterns is crucial; periods of calm winds exacerbate pollution, while stronger winds offer temporary relief. The transition months of April and November present fluctuating conditions, requiring increased vigilance.