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Ambohitompoina, nestled within the Antananarivo Province of Madagascar, occupies a geographically complex position at approximately -19.7569 latitude and 47.5722 longitude. The city’s location is characterized by a gradual urban–rural gradient, transitioning from a densely populated area to the surrounding highlands. Situated on the slopes of the Andranomaditra plateau, Ambohitompoina experiences significant elevation changes, contributing to localized microclimates and influencing air circulation patterns. The surrounding landscape is dominated by rolling hills, terraced agricultural fields, and patches of remnant forest, typical of the central highlands of Madagascar. While not directly adjacent to a major river, the area benefits from seasonal rainfall and groundwater sources, impacting humidity levels and potentially affecting pollutant dispersion. The proximity to Antananarivo, the nation’s capital, means Ambohitompoina is indirectly influenced by industrial activity and transportation emissions emanating from the larger urban center. Agricultural zones, primarily focused on rice cultivation and vegetable farming, are prevalent in the immediate vicinity, introducing potential sources of particulate matter from soil erosion and agricultural burning, particularly during land clearing periods. The terrain’s undulating nature can trap pollutants, especially during periods of low wind speed, creating localized air quality challenges. The city’s urban character is primarily residential, with limited industrial presence within Ambohitompoina itself, but its connection to Antananarivo’s broader economic network means it is not entirely isolated from industrial influences.

Ambohitompoina’s air quality is intrinsically linked to Madagascar’s distinct wet and dry seasons. The dry season, typically spanning from May to October, often sees a build-up of pollutants due to reduced rainfall and increased solar radiation. This period is characterized by lower humidity, which can exacerbate the effects of particulate matter, as it remains suspended in the air for longer durations. Temperature inversions, common during the cooler nights of the dry season, trap pollutants close to the ground, leading to potentially poorer air quality in the mornings. Agricultural burning, a practice used for land preparation, is most prevalent during this time, significantly contributing to particulate pollution. The wet season, from November to April, brings increased rainfall, which naturally helps to cleanse the atmosphere by washing away particulate matter. However, heavy rainfall can also lead to increased soil erosion, releasing dust and sediment into the air. Fog, a frequent occurrence during the wet season, can trap moisture and pollutants, creating localized pockets of reduced visibility and potentially impacting air quality. Outdoor activities are generally more favorable during the wet season, particularly in the afternoons after rainfall. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the dry season, especially on days with agricultural burning or stagnant air. The interplay of wind patterns, temperature fluctuations, and rainfall dictates the seasonal air quality narrative in Ambohitompoina, demanding adaptive strategies for public health.