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Santa Cecília, nestled within the state of Santa Catarina, Brazil, occupies a geographically significant position in the Serra Catarinense mountain range. Located at approximately -26.9608° latitude and -50.4269° longitude, the city’s elevation, averaging around 950 meters (3,117 feet) above sea level, contributes to a cooler climate compared to coastal regions of Santa Catarina. The surrounding landscape is dominated by rolling hills, dense Atlantic Forest remnants, and agricultural land, creating a distinct urban–rural gradient. Santa Cecília’s proximity to the Serra do Rio do Oeste mountain range influences local weather patterns, often resulting in orographic lift and localized rainfall. The city sits within a region characterized by a mix of small-scale agriculture, primarily focused on dairy farming and horticulture, and some light industrial activity concentrated in nearby larger towns. While Santa Cecília itself is relatively small with a population of 15,546, its location within a broader agricultural and industrial zone means that pollutants generated elsewhere can be transported into the area, particularly during periods of low wind. The Atlantic Forest, though diminished, still plays a crucial role in filtering air pollutants, but its effectiveness is dependent on its extent and health. The terrain, with its valleys and slopes, can also trap pollutants, leading to localized air quality issues. The city’s position inland, away from direct coastal breezes, can exacerbate these conditions, especially during calmer weather periods. The surrounding landscape’s composition—forest, farmland, and occasional industrial zones—directly shapes the types and sources of air pollutants impacting Santa Cecília.

Santa Cecília’s subtropical climate dictates a distinct seasonal pattern in air quality. The region experiences a wet and dry season, rather than the four traditional seasons. During the wet season (roughly November to March), increased rainfall generally leads to improved air quality as precipitation washes away particulate matter and pollutants. However, periods of intense rainfall can also trigger landslides and soil erosion, releasing dust and sediment into the air, temporarily degrading conditions. The dry season (April to October) presents a greater challenge. Reduced rainfall, coupled with increased solar radiation, leads to higher temperatures and a tendency for temperature inversions, particularly during the mornings. These inversions trap pollutants near the ground, concentrating them within the valley. Agricultural activities, such as burning fields after harvest (though increasingly regulated), contribute to particulate matter and smoke during this period. Wind patterns are crucial; calm conditions allow pollutants to accumulate, while stronger winds disperse them. Fog, common during the cooler months, further exacerbates the problem by trapping pollutants. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the dry season, particularly in the mornings when inversions are most likely. Outdoor activities are generally more favorable during the wet season, but vigilance is still advised during periods of heavy rainfall or dust storms. The agricultural cycle, with its associated burning practices (where permitted), significantly influences air quality throughout the year, demanding careful monitoring and mitigation strategies.