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Mutsamudu, the capital of Anjouan, Comoros, occupies a strategically significant coastal position on the western coast of the island, nestled within a dramatic volcanic landscape. Anjouan itself is a small island in the Mozambique Channel, part of the Comoros archipelago, situated between Madagascar and the African mainland. The city’s terrain is characterized by steep slopes rising sharply from the Indian Ocean, creating a unique urban morphology where buildings cling to the hillsides. The surrounding landscape is dominated by lush, tropical vegetation, including coconut plantations and clove farms, typical of the Comoros’ agricultural economy. The urban–rural gradient is relatively sharp; beyond the city limits, the landscape quickly transitions to dense forests and agricultural land, with small rural villages scattered across the island. Mutsamudu’s proximity to the ocean moderates temperatures but also introduces maritime influences on air quality, such as sea salt aerosols. There are no significant industrial belts directly adjacent to Mutsamudu; however, agricultural activities, particularly the burning of vegetation for land clearing and the processing of cloves, contribute to localized air pollution. The island’s volcanic origins have also left behind deposits of minerals that can occasionally become airborne, especially during periods of heavy rainfall or strong winds. The elevation of the city, ranging from sea level to several hundred meters on the surrounding hills, influences local wind patterns and can contribute to the formation of temperature inversions, trapping pollutants near the ground. The island’s isolation also limits the dispersal of pollutants, making air quality particularly sensitive to local emissions.

Mutsamudu experiences a tropical climate with distinct wet and dry seasons, significantly impacting air quality patterns. The wet season, typically from November to April, brings frequent rainfall and increased humidity. While the rain helps to cleanse the atmosphere by removing particulate matter, the associated cloud cover can also lead to reduced wind speeds, potentially trapping pollutants closer to the ground. The dry season, from May to October, is characterized by lower rainfall and higher temperatures. During this period, agricultural burning for land preparation and clove processing intensifies, leading to increased emissions of smoke and particulate matter. The drier conditions also exacerbate dust generation from unpaved roads and construction sites. Temperature inversions, common during the cooler months (July-August), can occur when a layer of warm air sits above cooler air near the ground, preventing vertical mixing and trapping pollutants. Fog, particularly in the mornings during the dry season, can also worsen air quality by reducing visibility and concentrating pollutants. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the dry season, particularly when agricultural burning is prevalent. Avoiding strenuous outdoor activity during periods of heavy smoke is advisable. The increased humidity during the wet season can exacerbate respiratory issues for some, so maintaining indoor air quality is important. Overall, the months of August and September tend to present the most challenging air quality conditions due to a combination of temperature inversions and agricultural activity.