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Curiúva, nestled in the state of Paraná, Brazil, occupies a geographically interesting position within the rolling hills of the Second Paraná Plateau. Located at coordinates -24.0328, -50.4578, the city’s terrain is characterised by moderate elevation changes, influencing local wind patterns and pollutant dispersion. The surrounding landscape is predominantly agricultural, dominated by soybean, corn, and wheat cultivation, alongside areas of native *Araucaria* forest remnants. This agricultural intensity is a key factor in potential air quality concerns, particularly related to seasonal burning practices and pesticide drift. Curiúva isn’t directly adjacent to major industrial belts, but its regional position means it can be affected by long-range transport of pollutants from more industrialised areas to the east and south. The urban-rural gradient is relatively sharp; the city centre is compact, quickly transitioning to farmland. Proximity to smaller rivers and streams contributes to localised humidity, potentially exacerbating particulate matter issues during calmer weather. The city’s location, shielded by higher terrain to the west, can sometimes lead to stagnant air conditions, trapping pollutants. Understanding these geographical nuances is crucial for assessing and mitigating air quality challenges in Curiúva.

Air quality in Curiúva experiences distinct seasonal variations, closely tied to Paraná’s subtropical climate. The austral summer (December-February) often sees increased particulate matter from agricultural activities – land preparation and harvesting – coupled with higher ozone levels due to intense sunlight and warmer temperatures. Rainfall, however, provides some natural cleansing. Autumn (March-May) brings a transition period, with decreasing temperatures and potentially more stable atmospheric conditions, leading to pollutant accumulation. This is often a period of increased burning of agricultural residue. Winter (June-August) is typically the period of best air quality, with cooler temperatures, increased rainfall, and reduced agricultural activity. However, temperature inversions can occur, trapping pollutants near the ground, especially in the early mornings. Spring (September-November) sees a resurgence of agricultural activity, including planting and pesticide application, potentially elevating airborne chemical concentrations. Sensitive individuals – children, the elderly, and those with respiratory conditions – should be particularly cautious during summer and autumn. Foggy conditions in winter can also exacerbate respiratory issues. Monitoring wind direction is key; winds from agricultural areas can carry pollutants into the city.