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Ampanotokana, nestled within the Antananarivo province of Madagascar, occupies a geographically complex position at approximately -18.7193° latitude and 47.3079° longitude. The city’s location is characterized by a gradual urban–rural gradient, transitioning from a densely populated area to the surrounding highlands and agricultural lands. Situated on the eastern slopes of the Andranomaditra plateau, Ampanotokana experiences significant elevation changes, contributing to localized microclimates and influencing air circulation patterns. The surrounding landscape is dominated by rolling hills, terraced rice paddies, and pockets of remnant forest, typical of the central highlands of Madagascar. While not directly adjacent to a major river, the city benefits from proximity to smaller streams and seasonal waterways that contribute to local humidity. The broader region is a vital agricultural zone, with extensive cultivation of rice, maize, and various fruits and vegetables. This agricultural activity, while crucial for the local economy, can contribute to particulate matter emissions, particularly during harvesting and burning seasons. Further afield, industrial activity is concentrated in Antananarivo, the capital, with potential for pollutants to be transported via prevailing winds. The terrain’s undulating nature can trap pollutants, especially during periods of low wind speed, creating localized air quality challenges. The city’s relatively small population (21,969) suggests a primarily rural character, but increasing urbanization pressures are likely to impact air quality in the coming years.

Ampanotokana’s tropical highland climate dictates a distinct wet and dry season cycle, profoundly impacting air quality. The dry season, typically spanning from May to October, often sees a build-up of pollutants due to reduced rainfall and lower atmospheric mixing. During this period, dust from agricultural activities, particularly soil preparation and harvesting, becomes a significant contributor to particulate matter. Temperature inversions, common during the cooler nights of the dry season, can trap pollutants close to the ground, exacerbating the issue. 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 humidity, potentially affecting respiratory health for sensitive individuals. Fog, a frequent occurrence during the wet season, can also trap pollutants, though generally to a lesser extent than temperature inversions. Months like September and October, marking the transition from dry to wet, often experience a peak in air quality concerns due to the combination of lingering dry season conditions and increased agricultural activity. Individuals with respiratory conditions, such as asthma, and young children should exercise caution during these periods, limiting outdoor exposure and monitoring for any adverse effects. The increased humidity during the wet season can also trigger allergic reactions in some individuals. Overall, understanding the interplay between rainfall, temperature, and agricultural practices is key to anticipating and mitigating air quality challenges in Ampanotokana.