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Cândido de Abreu, nestled in the state of Paraná, Brazil, occupies a geographically interesting position within the rolling hills of the second Paraná Plateau. Located at coordinates -24.5669, -51.3333, 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, with pockets of native Atlantic Forest remnants. This agricultural intensity is a key factor impacting air quality, through the use of fertilizers, pesticides, and seasonal burning practices. The city isn’t directly adjacent to major bodies of water, though several smaller rivers and streams traverse the region, potentially acting as conduits for agricultural runoff and associated pollutants. While not a heavily industrialized zone, regional industrial activity in larger nearby cities contributes to background pollution levels. The urban-rural gradient is relatively sharp; Cândido de Abreu itself is a comparatively small urban centre, quickly transitioning to expansive agricultural lands. This proximity to agricultural sources, combined with the plateau’s topography, creates specific challenges for maintaining clean air. The prevailing winds, often from the south and southwest, can carry pollutants from agricultural activities directly over the city, impacting local air quality.

Air quality in Cândido de Abreu experiences distinct seasonal variations closely tied to Paraná’s subtropical climate. During the warmer months (December to February), increased temperatures and sporadic rainfall can lead to higher ozone formation, particularly downwind of agricultural areas where volatile organic compounds are released. This period also sees increased activity related to harvesting, potentially raising particulate matter from field operations. Autumn (March to May) generally offers improved air quality as temperatures moderate and rainfall increases, washing away accumulated pollutants. However, this is also the period when farmers often engage in controlled burns to clear fields for the next planting season, causing temporary spikes in particulate matter and smoke. Winter (June to August) is typically the cleanest period, with cooler temperatures, reduced agricultural activity, and increased rainfall. However, temperature inversions can occur, trapping pollutants near the ground. Spring (September to November) marks the start of planting season, bringing increased use of fertilizers and pesticides, potentially impacting air quality. Sensitive individuals – children, the elderly, and those with respiratory conditions – should be particularly cautious during harvest and burning seasons. Monitoring wind direction and avoiding outdoor exertion on days with visible haze is advisable.