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Antongomena-Bevary, nestled within the Boeny region of Mahajanga State, Madagascar, presents a unique geographic context influencing its air quality. Situated at approximately -15.9549 latitude and 45.9403 longitude, the town occupies a relatively low-lying area, likely part of the broader coastal plain extending inland from the Mozambique Channel. The surrounding landscape is predominantly characterised by savanna and scrubland, typical of the western Madagascar ecoregion, interspersed with agricultural lands dedicated to rice cultivation and potentially vanilla or cocoa production. The terrain is generally flat, with subtle undulations, and the proximity to the sea introduces a constant influence of maritime air masses. While not a major industrial hub, Antongomena-Bevary serves as a regional market town, meaning increased traffic from agricultural transport and local commerce contributes to localised emissions. The urban-rural gradient is quite sharp; the town itself is a concentrated area of activity, quickly transitioning to rural agricultural landscapes. This proximity to agricultural practices, including potential slash-and-burn techniques, introduces seasonal particulate matter into the air. Dust from unpaved roads is also a significant factor, particularly during the dry season. The town’s location, shielded by limited topography, can also trap pollutants, exacerbating air quality issues.

Antongomena-Bevary experiences a distinct wet and dry season, profoundly impacting air quality. The wet season, generally from November to April, brings relief from particulate matter as rainfall effectively washes dust and pollutants from the atmosphere. However, increased humidity can foster mold growth, potentially triggering respiratory issues. The months of January and February typically see the heaviest rainfall and the clearest air. Conversely, the dry season, from May to October, witnesses a significant deterioration in air quality. This is primarily due to increased dust from unpaved roads and agricultural activities, coupled with a lack of precipitation to cleanse the air. The peak of dust pollution usually occurs between July and September, coinciding with the strongest trade winds carrying dust from inland areas. Temperature inversions, common during cooler nights in the dry season, can trap pollutants near ground level, worsening conditions. Sensitive groups – children, the elderly, and those with pre-existing respiratory conditions – should limit strenuous outdoor activity during these months. The transition periods, November and April, can be unpredictable, with fluctuating air quality. Monitoring local conditions and adopting preventative measures, such as wearing masks when dust levels are high, is advisable.