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Mandaguaçu, nestled in the state of Paraná, Brazil, occupies a gently undulating terrain within the larger Paraná Plateau. Located at coordinates -23.3469, -52.0950, the city’s elevation contributes to localized weather patterns influencing air dispersion. The surrounding landscape is predominantly agricultural, dominated by soybean, corn, and wheat cultivation, typical of the region’s fertile ‘terra roxa’ soils. This intensive agricultural activity is a key factor impacting air quality, through the use of fertilizers, pesticides, and biomass burning for land preparation. Mandaguaçu isn’t directly adjacent to major bodies of water, though it lies within the Paraná River basin, meaning humidity levels are generally moderate. The urban-rural gradient is relatively sharp; the city itself is compact, transitioning quickly to expansive farmland. While not a major industrial hub, the presence of agricultural processing facilities and associated transport networks contribute to particulate matter and nitrogen oxide emissions. The city’s position within Paraná means it experiences a subtropical climate, with distinct seasons that significantly affect pollutant concentrations. The prevailing winds, generally from the south and southwest, play a crucial role in dispersing or concentrating pollutants depending on atmospheric stability. Understanding this interplay between geography, agriculture, and climate is vital for assessing and mitigating air quality challenges in Mandaguaçu.

Mandaguaçu’s air quality follows a distinct seasonal pattern. The austral winter (June-August) often sees the poorest air quality, due to temperature inversions trapping pollutants near the ground. Reduced rainfall during this period also limits the natural cleansing of the atmosphere. Biomass burning associated with agricultural practices, though present year-round, tends to increase in preparation for the spring planting season, exacerbating particulate matter levels. Spring (September-November) brings increased rainfall, improving air quality, but also increased humidity which can foster fungal spores. Summer (December-February) is generally the cleanest period, with frequent rainfall and strong convective winds dispersing pollutants. However, high temperatures can promote the formation of ground-level ozone, particularly downwind of agricultural areas. Autumn (March-May) sees a transition period, with decreasing rainfall and increasing agricultural activity. Sensitive groups – children, the elderly, and those with respiratory conditions – should be particularly cautious during the winter months and periods of agricultural burning. Avoiding strenuous outdoor activity during these times is advisable. Monitoring wind direction is also crucial; pollutants will concentrate on the leeward side of emission sources. The wet season, generally from November to March, offers the most favourable conditions for outdoor activity.