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Rosário do Sul, nestled in the state of Rio Grande do Sul, Brazil, occupies a unique geographic position within the rolling hills of the Campanha Gaúcha. Located at coordinates -30.2578, -54.9139, the city’s terrain is characterized by gentle slopes and fertile plains, a landscape sculpted by ancient river systems. The Uruguay River flows nearby, influencing local humidity and occasionally contributing to fog formation, a factor impacting air quality. With a population of approximately 36,630, Rosário do Sul maintains a distinctly rural character, though its proximity to larger urban centers like Porto Alegre (approximately 480km distant) introduces some degree of regional connectivity. The surrounding landscape is dominated by extensive agricultural zones, primarily dedicated to cattle ranching and soybean cultivation. This agricultural activity, while economically vital, is a potential source of particulate matter from soil disturbance and agricultural burning. The urban-rural gradient is relatively sharp, with agricultural land immediately bordering the city limits. The elevation is moderate, around 150m above sea level, which doesn’t create strong temperature inversions but can still trap pollutants during calm weather conditions. Industrial activity is limited within Rosário do Sul itself, but regional transport corridors contribute to emissions.

Rosário do Sul experiences a humid subtropical climate, with distinct seasonal variations impacting air quality. Spring (September-November) brings increased rainfall, which generally improves air quality by washing away pollutants, though pollen counts can be high, affecting respiratory health. Summer (December-February) is warm and humid, with occasional heatwaves. While rainfall continues, stagnant air masses can lead to localized pollution build-up, particularly from vehicle emissions and agricultural activities. Autumn (March-May) is often characterized by stable atmospheric conditions and increased agricultural burning as farmers prepare fields for the next planting season, leading to a peak in particulate matter. This is a period to avoid strenuous outdoor activity for those with respiratory conditions. Winter (June-August) is the coolest and driest season, with frequent temperature inversions trapping pollutants near the ground. Fog is common, exacerbating the effects of particulate matter. Cold air holds less moisture, increasing the concentration of airborne particles. Sensitive groups – children, the elderly, and those with pre-existing respiratory or cardiovascular conditions – should limit outdoor exposure during calm, cold winter days. Monitoring wind patterns is crucial, as southerly winds can bring pollutants from more industrialized areas further south.