Campo Alegre Air Quality Index (AQI)

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Campo Alegre, nestled in the state of Alagoas, Brazil, occupies a unique geographic position within the semi-arid transition zone of the Northeast. Located at approximately -9.7819 latitude and -36.3508 longitude, the city sits amidst a gently undulating landscape of *agreste* terrain – a transitional zone between the coastal *mata* forest and the drier *sertão* interior. The elevation is modest, contributing to relatively warm temperatures year-round. Campo Alegre isn’t directly on the coast, but is influenced by maritime air masses, though these are often modified by the inland topography. The surrounding landscape is characterised by small-scale agriculture, primarily sugarcane and cassava, alongside pockets of preserved caatinga vegetation. This agricultural activity, while vital to the local economy, introduces potential sources of particulate matter from land preparation and burning. The urban-rural gradient is relatively sharp, with the city centre representing a concentrated area of human activity and potential emissions. The lack of significant industrial belts within Campo Alegre itself means that pollution sources are largely diffuse, stemming from vehicle traffic, domestic fuel burning, and agricultural practices. The prevailing winds, influenced by the trade winds, play a crucial role in dispersing or concentrating pollutants, depending on seasonal patterns and local topography. This interplay of factors significantly shapes the city’s air quality profile.

Campo Alegre experiences a distinct wet and dry season, rather than traditional four seasons. Air quality is generally better during the wet season (roughly April to August) due to increased rainfall which effectively washes particulate matter from the atmosphere. Higher humidity also suppresses dust resuspension. However, even during this period, localized pollution from agricultural burning can occur. The dry season (September to March) presents the greatest challenges. Reduced rainfall allows pollutants to accumulate, and the drier air facilitates the suspension of dust and soil particles. Temperature inversions, common during the cooler nights of the dry season, trap pollutants near the ground, exacerbating air quality issues. February and March are typically the months with the poorest air quality, coinciding with peak agricultural activity and drier conditions. Sensitive groups – children, the elderly, and individuals with respiratory conditions – should limit strenuous outdoor activity during these months. During the transition periods, fluctuating weather patterns can lead to unpredictable air quality. Monitoring local conditions and adopting preventative measures, such as using masks during dusty periods, is advisable. The consistent northeast trade winds offer some relief, but their effectiveness varies with the intensity of the dry season.