Bissorã Air Quality Index (AQI)

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Bissorã, nestled in the Oio region of Guinea-Bissau (12.2167° N, -15.4500° W), occupies a geographically significant position within a predominantly rural landscape. The city’s terrain is characterized by gently undulating plains, typical of the Guinea Shield, transitioning into a mosaic of savannah grasslands and gallery forests along the Cacheu River, which flows nearby. This riverine influence moderates local temperatures and contributes to a humid climate. Bissorã’s location is approximately 150km northeast of Bissau, the capital, placing it within a transitional zone between the densely populated coastal areas and the more sparsely inhabited interior. The surrounding landscape is dominated by small-scale agriculture – primarily cashew farming and rice cultivation – which, while vital to the local economy, can contribute to localized dust and biomass burning during harvest seasons. The urban–rural gradient around Bissorã is gradual; the city itself is relatively small, exhibiting a compact urban footprint with limited industrial activity. There are no major industrial belts immediately adjacent to Bissorã, minimizing direct industrial emissions. However, the prevalence of wood-fired cooking stoves in the surrounding rural communities and within Bissorã itself, coupled with seasonal agricultural practices, are key factors influencing the city’s air quality profile. The elevation is relatively low, averaging around 20 meters above sea level, which can exacerbate the trapping of pollutants under certain meteorological conditions. The proximity to the Cacheu River also introduces a potential source of humidity and localized fog, impacting pollutant dispersion.

Bissorã’s tropical climate dictates a distinct wet and dry season pattern, profoundly influencing its air quality. The dry season, typically spanning from November to May, is characterized by reduced rainfall and increased temperatures. This period often sees a rise in particulate matter due to agricultural burning practices associated with land clearing and crop residue disposal. The drier air also allows for greater dust suspension from the surrounding savannah, particularly during periods of wind. Temperature inversions, where cooler air is trapped beneath a layer of warmer air, are more frequent during the dry season, hindering vertical mixing and concentrating pollutants near ground level. Conversely, the wet season (June to October) brings frequent rainfall, which naturally scavenges pollutants from the atmosphere, leading to a noticeable improvement in air quality. However, periods of intense rainfall can also lead to flooding, potentially releasing mould spores and other allergens into the air. Fog, more common during the transition periods between wet and dry seasons, can trap pollutants, creating localized pockets of poor air quality. During the dry season months of February and March, outdoor activities should be approached with caution, especially for individuals with respiratory sensitivities. The wettest months, August and September, generally offer the best air quality. Sensitive groups, including children, the elderly, and those with pre-existing respiratory conditions, should be particularly mindful of air quality during the dry season and avoid prolonged exposure to outdoor environments during periods of agricultural burning or fog.