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Andoany, nestled in the Antsiranana region of northern Madagascar, presents a unique geographic context influencing its air quality. Situated at approximately -13.4000 latitude and 48.2666 longitude, the city lies along the Indian Ocean coastline, benefiting from maritime breezes but also vulnerable to oceanic influences on pollution dispersal. The terrain is generally low-lying, transitioning from coastal plains to slightly undulating land inland. This proximity to the ocean moderates temperatures but also contributes to high humidity. Andoany’s urban character is that of a port town, serving as a crucial link for trade and fishing. Surrounding the city are areas of traditional *ve-ve* (slash-and-burn agriculture), particularly rice paddies, and patches of dry deciduous forest. While not heavily industrialized, the port activity generates localized emissions from shipping and handling of goods. The urban-rural gradient is relatively sharp, with agricultural land quickly giving way to denser settlement near the coast. Dust from unpaved roads and agricultural practices, combined with potential smoke from biomass burning, are key factors impacting local air quality. The prevailing winds, influenced by the southeast trade winds, play a significant role in dispersing or concentrating pollutants depending on the season.

Andoany experiences a distinct wet and dry season, heavily influencing air quality. The dry season, roughly from May to October, sees a significant increase in particulate matter. Reduced rainfall means less atmospheric cleansing, and agricultural burning for land preparation becomes more prevalent, releasing substantial smoke. The southeast trade winds, while generally dispersing pollutants, can also carry smoke from inland fires directly over the city. November marks the transition, with sporadic rainfall offering temporary relief. The wet season, from November to April, generally brings improved air quality due to frequent rainfall washing away pollutants. However, high humidity can trap pollutants near the ground, particularly during periods of calm weather. January and February often experience the heaviest rainfall, offering the cleanest air. Temperature inversions, though less common than in temperate climates, can occur during calmer periods, trapping pollutants. Sensitive groups – children, the elderly, and those with respiratory conditions – should be particularly cautious during the dry season, limiting strenuous outdoor activity. Monitoring wind direction during agricultural burning is crucial for avoiding exposure to smoke plumes. The transition months require vigilance, as conditions can change rapidly.