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Ambatoharanana, a small city in the Toamasina region of Madagascar, is situated at approximately -17.3424 latitude and 49.1186 longitude. Its location is characterised by a humid tropical climate and a relatively low elevation, contributing to specific air quality challenges. The city lies inland, approximately 25km from the Indian Ocean coastline, and is nestled within a landscape dominated by lush, tropical rainforest and agricultural lands. The surrounding terrain is gently undulating, with a gradual rise towards the interior highlands. This proximity to the ocean influences local weather patterns, bringing moisture and humidity. While not a major industrial hub, Ambatoharanana serves as a regional market centre for agricultural produce, particularly vanilla and cloves, grown in the surrounding areas. The urban-rural gradient is quite sharp; the city centre is densely populated, while the periphery quickly transitions into agricultural fields and forested areas. This blend of agricultural activity, limited industrial presence, and tropical climate creates a unique set of conditions impacting air quality. The lack of significant wind corridors due to the surrounding terrain can also contribute to localised pollutant build-up, particularly during calmer periods. Dust from unpaved roads and agricultural practices are likely significant contributors to particulate matter.

Ambatoharanana experiences a distinct wet and dry season, rather than traditional four seasons. Air quality is generally better during the wet season (November to April) due to rainfall effectively washing away particulate matter and suppressing dust. However, increased humidity can also promote mould growth, potentially impacting respiratory health. Pollution levels tend to peak during the dry season (May to October) when agricultural burning is common, preparing fields for the next planting cycle. This practice releases significant amounts of smoke and particulate matter into the air. The dry season also sees increased dust from unpaved roads and construction activities. Temperature inversions, where a layer of warm air traps cooler air near the ground, can exacerbate pollution during calm mornings in the dry season. October is often the month with the poorest air quality due to the culmination of dry season agricultural practices. For sensitive groups – children, the elderly, and those with respiratory conditions – avoiding strenuous outdoor activity during the dry season, particularly in October, is advisable. Monitoring local conditions and staying indoors when smoke is visible is crucial. The transition periods between wet and dry seasons can also bring fluctuating air quality, requiring vigilance.