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Araruna, nestled in the state of Paraná, Brazil, occupies a geographically significant position within the broader Southern Brazilian landscape. Located at approximately -23.9319° latitude and -52.4958° longitude, the city sits within a gently undulating terrain characteristic of the Paraná River basin. The surrounding landscape is a mosaic of agricultural fields, primarily dedicated to soybean and maize cultivation, interspersed with patches of native Cerrado vegetation, though this latter is increasingly fragmented. Araruna’s elevation is relatively low, averaging around 350 meters above sea level, contributing to a generally stable atmospheric layer, but also potentially exacerbating ground-level pollutant concentrations under certain meteorological conditions. The city’s proximity to the Paraná River, though not directly on its banks, influences local humidity and temperature patterns. It’s situated within a transitional zone between the more densely populated urban centers of Curitiba and Londrina, exhibiting a gradual urban-rural gradient. While Araruna itself is a relatively small municipality, it benefits from its connectivity to regional transportation networks, facilitating the movement of goods and people. This connectivity, however, also introduces potential sources of air pollution from vehicular traffic and associated industrial activities in nearby areas. The dominant land use pattern is a blend of residential areas, small-scale commercial establishments, and extensive agricultural zones, creating a unique interplay between rural and urban influences on the local air quality. The prevailing winds, generally easterly, play a crucial role in dispersing or concentrating pollutants, depending on their strength and stability.

Araruna’s subtropical climate dictates a distinct seasonal pattern influencing air quality. The region experiences a warm, humid summer (December to February) and a mild, drier winter (June to August), with transitional periods in between. Summer months often see increased humidity and stagnant air conditions, particularly during periods of intense heat, which can trap pollutants near the ground. Agricultural burning, a common practice for land clearing and crop residue management, significantly contributes to particulate matter pollution during this season, often peaking in January and February. The wet season, spanning from October to March, brings frequent rainfall, which naturally helps to cleanse the atmosphere by removing particulate matter, leading to improved air quality. However, heavy rainfall can also lead to increased levels of ozone, a secondary pollutant formed through photochemical reactions. Winter months, characterized by cooler temperatures and less rainfall, can occasionally experience temperature inversions, where a layer of warm air sits above cooler air near the ground. This phenomenon traps pollutants, leading to localized episodes of reduced air quality. Spring (September to November) and Autumn (March to May) generally offer the most favourable conditions for outdoor activities, with moderate temperatures, increased wind speeds, and less agricultural burning. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the summer months and be mindful of potential temperature inversion events in winter. Minimizing outdoor exertion during periods of visible haze or smoke is advisable.