Nosy Varika Air Quality Index (AQI)

Loading live AQI data...

Loading historical AQI trends...

Nosy Varika, a coastal town in the Fianarantsoa region of Madagascar, presents a unique geographic context influencing its air quality. Situated at approximately -20.5877 latitude and 48.5354 longitude, the town lies on the east coast, directly adjacent to the Indian Ocean. The terrain is largely defined by a low-lying coastal plain, transitioning inland to a more undulating landscape and eventually the forested highlands. This proximity to the ocean introduces significant humidity and salt spray into the air, impacting particulate matter composition. The town’s urban character is relatively small, with a population of around 19,787, and is heavily reliant on agriculture, particularly vanilla cultivation, which dominates the surrounding landscape. This agricultural activity, while economically vital, contributes to seasonal biomass burning for land clearing and processing, a key source of localised air pollution. The urban-rural gradient is sharp, with dense vegetation immediately surrounding the town, but increasing deforestation further inland. There are no major industrial belts within Nosy Varika itself, but regional transport routes, including coastal shipping, contribute to emissions. The prevailing winds, generally from the east, carry maritime influences and potentially pollutants along the coastline, concentrating them in areas like Nosy Varika.

Nosy Varika experiences a distinct tropical climate, characterized by a wet season (November to April) and a dry season (May to October). Air quality fluctuates dramatically with these shifts. During the wet season, increased rainfall generally leads to improved air quality as pollutants are washed from the atmosphere. However, high humidity can also trap pollutants near the ground, creating localised pockets of poor air quality, particularly in the town centre. The dry season, conversely, sees a significant increase in particulate matter due to agricultural burning associated with vanilla processing and land preparation for the next planting cycle. This is most pronounced between August and October. Temperature inversions, common during the cooler nights of the dry season, exacerbate the problem by preventing vertical mixing of air. Winds are generally light during this period, further concentrating pollutants. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit strenuous outdoor activity during these months. The transition months of November and April can be unpredictable, with fluctuating rainfall and potential for localised burning. Monitoring wind direction is crucial; winds from inland during the dry season signal increased pollution risk. Overall, the wet season offers the most favourable conditions for outdoor activity.