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Astorga, Paraná, nestled within the Brazilian state’s southwestern region, occupies a geographically significant position within the Paraná River basin. Its coordinates, -23.2328, -51.6658, place it on a gently undulating plateau, part of the larger Paraná Plateau, with an average elevation of approximately 350 meters above sea level. The surrounding landscape is characterized by a transition zone between the Cerrado savanna and the Atlantic Forest biomes, influencing local vegetation and microclimates. While not directly adjacent to the Paraná River itself, Astorga benefits from its proximity, impacting regional humidity and rainfall patterns. The city’s urban fabric is relatively compact, reflecting its historical development as an agricultural service center. The dominant land use is residential, interspersed with commercial areas and agricultural processing facilities. A gradual urban-rural gradient extends outwards, transitioning into extensive agricultural lands – primarily soybean and maize cultivation – which are characteristic of Paraná’s productive interior. This agricultural activity, coupled with occasional livestock farming, contributes to localized sources of air pollutants, particularly during planting and harvesting seasons. The terrain’s gentle slopes and relatively sheltered location can, at times, exacerbate the effects of temperature inversions, trapping pollutants closer to the ground. The absence of major industrial belts directly bordering Astorga mitigates some pollution risks, but transportation corridors carrying goods to and from larger urban centers contribute to vehicular emissions. The city’s location within a humid subtropical climate zone further influences atmospheric conditions and pollutant dispersion.

Astorga’s air quality experiences a distinct seasonal rhythm dictated by its humid subtropical climate. 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 temporarily elevate dust levels. The dry season, from April to September, presents a more complex picture. During this period, reduced rainfall and increased evapotranspiration lead to lower humidity, which can exacerbate the effects of temperature inversions, particularly during the cooler months of June and July. These inversions trap pollutants near the ground, potentially increasing concentrations of particulate matter and ozone precursors. The agricultural cycle significantly impacts air quality; burning of agricultural residues after harvest, a common practice in the region, contributes to elevated particulate matter levels, especially in September and October. Wind patterns play a crucial role; prevailing winds from the south-west generally disperse pollutants, but periods of calm or stagnant air can lead to localized build-up. Fog, more frequent during the dry season, can also trap pollutants. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during periods of temperature inversions and agricultural burning, limiting outdoor exertion and monitoring local air quality information. The spring months (September-November) often present a challenging combination of agricultural activity and transitioning weather patterns, requiring heightened awareness.