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Terra Rica, nestled in the heart of Paraná state, Brazil, occupies a strategic position within the broader Cerrado biome and the southern fringes of the Amazon rainforest influence. Located at approximately -22.7089° latitude and -52.6169° longitude, the city’s elevation averages around 330 meters above sea level, contributing to a relatively mild climate. The surrounding landscape is characterized by a mosaic of agricultural land – primarily soybean and maize cultivation – interspersed with patches of native Cerrado vegetation, a savanna-like ecosystem. This agricultural intensity is a key factor influencing regional air quality. Terra Rica sits within a transitional zone, experiencing a gradual urban–rural gradient as one moves outwards from the city center. The Ivaí River, a significant waterway, flows nearby, potentially moderating local humidity but also presenting a pathway for pollutants to disperse along its course. While not directly adjacent to a major industrial belt, Terra Rica’s proximity to larger agricultural processing centers and transportation routes (particularly highways facilitating soybean exports) introduces localized sources of particulate matter and gaseous pollutants. The terrain is generally flat, which can exacerbate the accumulation of pollutants, particularly during periods of stagnant air. The city’s growth pattern reflects a typical Brazilian pattern, with a central core expanding outwards, often lacking comprehensive urban planning, which can impact ventilation and air circulation within the urban fabric. The prevailing winds, generally from the southeast, play a crucial role in dispersing or concentrating pollutants depending on seasonal patterns.

Terra Rica’s tropical climate dictates a distinct wet and dry season cycle, profoundly impacting air quality throughout the year. The dry season, typically spanning from April to September, often witnesses a noticeable increase in particulate matter concentrations. This is largely attributable to agricultural burning practices, employed to clear land for planting and harvesting. While regulated, these burns frequently occur, releasing significant amounts of smoke and soot into the atmosphere. The lack of rainfall during this period allows these particles to linger, especially when coupled with temperature inversions – a common meteorological phenomenon where a layer of warm air traps cooler air near the ground, preventing vertical mixing. Conversely, the wet season (October to March) brings frequent rainfall, naturally cleansing the air and reducing particulate pollution. However, the increased humidity can exacerbate respiratory issues for sensitive individuals. Fog, particularly during the transition months (March/April and September/October), can trap pollutants close to the ground, creating localized pockets of poor air quality. Wind patterns are generally more dynamic during the wet season, aiding in pollutant dispersion. The months of August and September, coinciding with peak agricultural burning, are generally periods to avoid strenuous outdoor activity, particularly for children, the elderly, and those with pre-existing respiratory conditions. During the wet season, while overall air quality improves, maintaining indoor air quality through proper ventilation and filtration is still advisable, especially during periods of high humidity. Individuals with asthma or allergies should monitor local pollen levels, which can fluctuate seasonally.