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Cêrro Largo, nestled in the heart of Rio Grande do Sul, Brazil, occupies a geographically significant position within the state's agricultural belt. Located at approximately -28.1489° latitude and -54.7378° longitude, the city’s elevation of around 550 meters above sea level contributes to a slightly cooler climate compared to coastal regions. The surrounding landscape is predominantly characterized by undulating plains and rolling hills, typical of the pampa biome, a vast grassland ecosystem. This terrain influences local wind patterns, which can both disperse and concentrate pollutants. Cêrro Largo’s proximity to extensive agricultural lands, particularly soybean and wheat fields, means that agricultural practices, including fertilizer application and pesticide spraying, can contribute to localized air quality concerns, especially during planting and harvesting seasons. While not directly adjacent to major rivers, the region receives rainfall contributing to groundwater recharge and influencing humidity levels. The urban–rural gradient around Cêrro Largo is relatively gradual, with smaller agricultural settlements and rural communities interspersed throughout the landscape. The city itself exhibits a compact urban form, with a central core surrounded by residential areas and agricultural infrastructure. The lack of significant industrial zones within the immediate vicinity mitigates some industrial pollution risks, but the reliance on agricultural machinery and transportation networks still presents challenges for maintaining optimal air quality. The prevailing winds, often originating from the south, play a crucial role in the dispersion of pollutants across the region.

Cêrro Largo experiences a subtropical climate with distinct seasonal variations that significantly impact air quality. The wet season, typically spanning from October to March, brings frequent rainfall, which naturally helps to cleanse the atmosphere by removing particulate matter and gaseous pollutants. However, increased humidity during this period can exacerbate respiratory issues for sensitive individuals. The dry season, from April to September, often sees a build-up of pollutants due to reduced rainfall and increased evapotranspiration from agricultural fields. Agricultural burning, a common practice for land clearing and residue disposal, is most prevalent during this period, leading to elevated levels of smoke and particulate matter. Temperature inversions, where cooler air is trapped beneath a layer of warmer air, are more common during the cooler months (June-August), hindering vertical mixing and trapping pollutants near the ground. Fog, particularly in the mornings during the dry season, can also worsen air quality by reducing visibility and concentrating pollutants. The months of August and September often present the most challenging air quality conditions due to a combination of agricultural burning, temperature inversions, and reduced rainfall. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should limit outdoor activity during these periods and monitor local air quality reports. During the wetter months, while overall air quality tends to be better, individuals with allergies should be mindful of pollen levels and mold spores. Maintaining indoor air quality through proper ventilation and air filtration is always recommended, especially during periods of elevated pollution.