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Sengés, Paraná, nestled within the expansive Paraná state of Brazil, occupies a geographically significant position within the country’s southern region. Located at approximately -24.1128° latitude and -49.4639° longitude, the city sits at a modest elevation, contributing to a relatively mild climate. The surrounding landscape is characterized by a blend of rolling hills and fertile plains, typical of the Paraná River basin. This basin’s influence is evident in the presence of smaller tributaries and waterways that crisscross the region, providing vital resources for agriculture. Sengés’s urban character is that of a small, developing municipality, largely shaped by its agricultural roots. The dominant land use is agricultural, with extensive soybean, maize, and sugarcane cultivation occurring in the immediate vicinity. This proximity to intensive agricultural zones introduces potential sources of air pollution, particularly from pesticide drift and fertilizer application. The urban–rural gradient is gradual, with agricultural fields seamlessly transitioning into residential areas. While Sengés isn't directly adjacent to major industrial belts, it’s within reasonable proximity to larger urban centers and industrial areas in Paraná, which can occasionally contribute to transported pollutants. The terrain, while generally flat, experiences localized variations that can influence local wind patterns and, consequently, the dispersion of air pollutants. The Paraná River itself, though not immediately bordering Sengés, exerts a regional climatic influence, moderating temperatures and impacting humidity levels, which in turn affects pollutant behavior.

Sengés experiences a subtropical climate with distinct wet and dry seasons, significantly impacting its air quality profile. The wet season, typically spanning from November to March, brings frequent rainfall and higher humidity. While the rain naturally helps to cleanse the atmosphere by removing particulate matter, the increased humidity can trap pollutants closer to the ground, particularly during periods of reduced wind. The dry season, from April to October, is characterized by lower rainfall and drier air. This often leads to a build-up of pollutants, especially during periods of agricultural activity when burning of crop residues is sometimes practiced, although increasingly regulated. Temperature inversions, common during the cooler months (June-August), can trap pollutants in a layer near the ground, exacerbating air quality issues. These inversions occur when a layer of warm air sits above cooler air, preventing vertical mixing. During the wet season, fog can form, particularly in the mornings, which similarly traps pollutants and reduces visibility. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during periods of stagnant air, especially following dry spells or during temperature inversions. Outdoor activities are generally more favorable during the wetter months, although vigilance is still advised. The agricultural cycle dictates much of the pollution pattern; periods of planting and harvesting, particularly when accompanied by dry conditions, often see a rise in particulate matter due to dust and potential burning practices. Careful monitoring of local weather conditions and agricultural activities is crucial for assessing air quality risks.