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Porecatu, nestled in the state of Paraná, Brazil, occupies a strategically important position within the broader Southern Brazilian landscape. Located at approximately -22.7558° latitude and -51.3789° longitude, the city sits within a gently undulating plateau region, part of the Paraná River basin. The surrounding terrain is characterized by a mix of agricultural land, primarily dedicated to soybean and maize cultivation, and patches of remnant Atlantic Forest, though significantly diminished from its original extent. Porecatu’s elevation, around 550 meters above sea level, contributes to a generally temperate climate, but also influences local air circulation patterns. The city’s proximity to the larger industrial belt centered around Maringá, roughly 100 kilometers to the northwest, introduces a potential source of regional air pollution, though Porecatu itself is a relatively small urban center. The urban–rural gradient transitions quickly, with agricultural fields and smaller settlements bordering the city limits. The Ivaí River, a tributary of the Paraná River, flows nearby, providing a local water source and potentially influencing humidity levels and localized weather phenomena. The prevailing winds generally flow from the southeast, carrying air masses across the agricultural plains and potentially impacting Porecatu’s air quality depending on upwind conditions. The landscape’s relatively flat nature, combined with the moderate elevation, can sometimes lead to stagnant air conditions, particularly during periods of stable atmospheric pressure, exacerbating the impact of local emissions.

Porecatu experiences a subtropical climate with distinct wet and dry seasons, significantly impacting its air quality profile. The wet season, typically spanning from October to March, brings frequent rainfall and higher humidity, generally leading to improved air quality as precipitation washes away particulate matter and dilutes gaseous pollutants. However, intense storms can occasionally stir up dust and soil, temporarily degrading air quality. The dry season, from April to September, presents a different set of challenges. Reduced rainfall and lower humidity contribute to a build-up of pollutants, particularly during periods of agricultural burning, a common practice for land clearing and crop residue management. This practice, often occurring in September and October, can significantly elevate particulate matter concentrations. Temperature inversions, more frequent during the cooler months (June-August), trap pollutants near the ground, worsening air quality. Fog, also more common during these months, further restricts air movement and concentrates pollutants. Outdoor activities are generally more favorable during the wet season, particularly from November to February. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the dry season, especially when agricultural burning is prevalent. Monitoring local weather forecasts and avoiding strenuous outdoor activity on days with stagnant air or visible smoke is advisable. The combination of agricultural practices and seasonal meteorological patterns creates a dynamic air quality environment in Porecatu, requiring vigilance and proactive measures to protect public health.