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Rio Branco do Sul, nestled in the Serra do Mar mountain range of Paraná, Brazil, occupies a geographically complex position within the Atlantic Forest biome. Located approximately 35 kilometers southwest of Curitiba, the state capital, it represents a crucial point in the urban–rural gradient, transitioning from a rapidly expanding metropolitan area to a more agrarian landscape. The city’s coordinates (-25.1900, -49.3139) place it at an elevation ranging from 900 to 1200 meters above sea level, contributing to cooler temperatures and increased humidity compared to lower-lying regions. The surrounding landscape is dominated by steep, forested slopes, interspersed with small agricultural plots and pastureland. The proximity to the Ivaí River, though not directly within the city limits, influences local microclimates and provides a potential source of moisture. While not directly adjacent to major industrial belts, Rio Branco do Sul’s location within the Curitiba metropolitan area means it is indirectly affected by industrial emissions originating from the capital. Agricultural activities, particularly soy cultivation and livestock farming in the broader region, contribute to particulate matter and ammonia emissions. The topography, with its steep slopes and valleys, can trap pollutants, especially during periods of low wind speed, exacerbating localized air quality issues. The Atlantic Forest itself, while a natural air purifier, is increasingly fragmented, reducing its capacity to mitigate pollution effectively. The city’s growth, driven by its proximity to Curitiba and its relatively lower cost of living, is placing increasing pressure on the surrounding environment and potentially impacting air quality.

Rio Branco do Sul experiences a subtropical climate characterized by distinct wet and dry seasons, significantly influencing its air quality profile. The wet season, typically spanning from November to March, brings frequent rainfall and high humidity. While precipitation naturally helps to cleanse the atmosphere by removing particulate matter, the increased humidity can also contribute to the formation of ground-level ozone, particularly during periods of intense sunlight following rainfall. The dry season, from April to October, is often marked by lower rainfall and increased temperatures. This period frequently sees a rise in particulate matter concentrations, stemming from agricultural burning practices in the surrounding rural areas – a common, though often regulated, land management technique. Temperature inversions, where cooler air becomes trapped beneath a layer of warmer air, are more prevalent during the dry season, particularly in the mornings, preventing pollutants from dispersing and leading to localized air quality degradation. Fog, common during the cooler months (June-August), can also trap pollutants near the ground. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during periods of agricultural burning and when fog is present. Outdoor activities are generally more favorable during the wet season, although ozone levels should still be monitored. The transition months (October and April) often present a mixed picture, with fluctuating rainfall and temperature patterns, requiring adaptable health guidance. Understanding these seasonal variations is crucial for mitigating the impacts of air pollution on public health in Rio Branco do Sul.