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Antehiroka, nestled within the Analamanga Region of Madagascar, presents a unique geographic challenge to air quality. Situated at approximately -18.8492 latitude and 47.4828 longitude, the city occupies a plateau landscape, part of the central highlands, at an elevation of roughly 1,200 meters. This elevation, while contributing to a comparatively cooler climate than coastal regions, also fosters temperature inversions, trapping pollutants near ground level. The surrounding terrain is characterised by rolling hills and agricultural lands, primarily rice paddies and small-scale farming. The proximity to Antananarivo, the capital, creates a degree of urban-rural gradient, with Antehiroka experiencing increasing pressures from migration and associated development. While not directly on a major waterway, the city is influenced by seasonal rainfall patterns and runoff from the highlands. Limited industrial activity within Antehiroka itself is offset by the broader industrial presence in the capital, with prevailing winds potentially carrying pollutants from Antananarivo towards Antehiroka. Deforestation in the surrounding hills, a significant environmental issue in Madagascar, contributes to soil erosion and dust, impacting particulate matter concentrations. The urban layout is relatively dispersed, with a mix of traditional housing and newer constructions, influencing ventilation patterns and pollutant dispersion.

Antehiroka’s air quality follows a distinct wet and dry season pattern, dictated by Madagascar’s tropical highland climate. The wet season, generally from November to April, brings relief from particulate matter pollution. Frequent rainfall effectively washes dust and other airborne particles from the atmosphere, improving visibility and air quality. However, increased humidity can promote mold growth, potentially exacerbating respiratory issues. The dry season, from May to October, witnesses a significant deterioration in air quality. Reduced rainfall allows dust from agricultural activities and unpaved roads to accumulate, leading to higher concentrations of PM10 and PM2.5. Cooler temperatures during the dry season can also create temperature inversions, trapping pollutants. August and September are typically the months with the poorest air quality. Sensitive groups – children, the elderly, and individuals with pre-existing respiratory conditions – should limit strenuous outdoor activity during these periods. Burning of agricultural waste, common after the harvest, further degrades air quality in the late dry season. Monitoring wind patterns is crucial; winds from the direction of Antananarivo can bring in pollutants from the capital’s industrial areas.