Maroantsetra Air Quality Index (AQI)

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Maroantsetra, a coastal city in northeastern Madagascar’s Toamasina region, occupies a unique geographical position at the mouth of the Antainambalana River, near the Bay of Antongil. Situated at approximately -15.4333° latitude and 49.7333° longitude, the city’s terrain is largely flat, transitioning quickly to lush rainforests and mangrove swamps inland. This low elevation, combined with its coastal location, makes Maroantsetra particularly vulnerable to the impacts of both marine and terrestrial pollution sources. The surrounding landscape is dominated by the Masoala National Park, a biodiversity hotspot, but also includes areas of traditional *tavy* (slash-and-burn agriculture) which contribute to particulate matter during the dry season. The urban-rural gradient is sharp; the city centre is densely populated, while the periphery quickly dissolves into rural agricultural land and dense forest. The bay’s limited flushing capacity can exacerbate pollutant concentrations, particularly during periods of low river flow. There are no major industrial belts within Maroantsetra itself, but shipping activity in the bay and regional agricultural practices are key factors influencing local air quality. The prevailing winds, influenced by the Indian Ocean monsoon, play a crucial role in dispersing or concentrating pollutants.

Maroantsetra experiences a distinct wet and dry season, heavily influencing air quality. The wet season, roughly November to April, generally sees improved air quality due to rainfall scavenging particulate matter and suppressing dust. However, increased humidity can foster mold growth, potentially impacting respiratory health. The heaviest rainfall occurs between January and March, offering the cleanest air, though flooding can disrupt daily life. The dry season, May to October, brings significantly poorer air quality. Agricultural burning for land preparation is prevalent during this period, releasing substantial smoke and particulate matter, particularly in July and August. Temperature inversions, common during the cooler dry season nights, trap pollutants near ground level, worsening conditions. Winds are generally weaker during the dry season, reducing dispersion. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit outdoor activity during peak burning periods. The transition months of November and April can be unpredictable, with fluctuating air quality. Monitoring wind direction is crucial; winds from inland agricultural areas will likely carry smoke and dust towards the city.