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Dionísio Cerqueira, nestled in the westernmost part of Santa Catarina state, Brazil, occupies a unique geographic position bordering Argentina and Paraguay. The city’s coordinates (-26.2550, -53.6400) place it within a gently undulating landscape of the Paraná Basin, characterized by rolling hills and fertile plains. Elevation varies, but generally remains between 300-500 meters above sea level. This relatively low elevation, combined with its inland location, influences air quality. The Uruguay River forms a significant natural boundary to the west, while the city is surrounded by extensive agricultural lands, primarily dedicated to soybean, corn, and wheat cultivation, and increasingly, livestock farming. The urban-rural gradient is quite sharp; the city centre is compact, transitioning rapidly to agricultural fields. While not a major industrial hub, regional agricultural processing facilities contribute to localised emissions. The surrounding landscape offers limited natural dispersion of pollutants, particularly during periods of atmospheric stability. The convergence of air masses from different regions, due to its tri-border location, can also concentrate pollutants. The terrain’s gentle slopes hinder effective drainage of stagnant air, potentially exacerbating pollution episodes. Understanding this interplay of geography and land use is crucial for managing air quality in Dionísio Cerqueira.

Dionísio Cerqueira experiences a humid subtropical climate, with distinct wet and dry seasons rather than traditional four seasons. Air quality generally improves during the wet season (October to March) due to increased rainfall which effectively washes particulate matter from the atmosphere. However, high humidity can also promote the formation of secondary pollutants. The dry season (April to September) presents the greatest air quality challenges. Agricultural burning, a common practice for land preparation, significantly increases particulate matter concentrations, particularly in May and June. Temperature inversions, frequently occurring during calm, clear nights in the winter months (June-August), trap pollutants near the ground, leading to localised build-ups. Winds are generally light, offering limited dispersion. August and September often see increased dust from agricultural activities. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit strenuous outdoor activity during these periods. Fog, common in the cooler months, can exacerbate respiratory issues by trapping pollutants. Monitoring wind patterns is crucial; southerly winds can bring pollutants from more industrialised areas further south. Avoiding outdoor exercise during peak agricultural burning times is advisable.