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Corbélia, nestled in the westernmost reaches of Paraná state, Brazil, occupies a gently undulating landscape within the larger Paraná Plateau. Its coordinates (-24.7989, -53.3069) place it within a transitional zone between the cerrado savanna and the Atlantic Forest biome, though significant agricultural conversion has altered the original vegetation cover. The city’s elevation, approximately 550 meters above sea level, contributes to relatively stable atmospheric conditions, potentially trapping pollutants. Corbélia is surrounded by extensive agricultural lands, primarily dedicated to soybean, corn, and wheat cultivation, with a growing presence of livestock farming. This agricultural dominance is a key factor influencing local air quality. The urban-rural gradient is quite sharp; the city itself is compact, with a population of around 17,470, quickly giving way to expansive farmland. While no major industrial belts are directly within Corbélia, regional processing facilities for agricultural products are present in nearby towns, contributing to regional background pollution. The lack of significant natural barriers like mountains or large bodies of water means that wind patterns play a crucial role in dispersing – or concentrating – airborne particles. The Ivaí River, while not immediately adjacent, influences local humidity and can contribute to fog formation, impacting pollutant dispersion. Understanding this interplay of terrain, land use, and climate is vital for assessing air quality challenges.

Corbélia experiences a distinct wet and dry season, rather than traditional four seasons. Air quality generally improves during the wet season (October to April) due to rainfall scavenging particulate matter from the atmosphere. However, increased humidity can also foster mold growth, potentially exacerbating respiratory issues. The dry season (May to September) presents the greatest air quality concerns. Agricultural burning, a common practice for land preparation, dramatically increases particulate matter (PM2.5 and PM10) levels during this period, particularly in July and August. Stable atmospheric conditions, characterized by temperature inversions, frequently occur during the cooler, drier months, trapping pollutants near the ground. Winds are generally weaker during the dry season, reducing dispersion. Fog, common in the mornings during the transition periods, can also trap pollutants. Sensitive groups – children, the elderly, and individuals with pre-existing respiratory or cardiovascular conditions – should limit strenuous outdoor activity during peak burning periods. Monitoring wind direction is crucial; pollutants will concentrate downwind of burning activities. The months of November and December, marking the start of the wet season, typically offer the best air quality for outdoor pursuits. Avoiding outdoor exertion during peak burning hours in the dry season is advisable.