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São Jerônimo, nestled in the state of Rio Grande do Sul, Brazil, occupies a gently undulating landscape within the broader Campos Gerais region. Located at coordinates -29.9589, -51.7219, the city sits approximately 85 kilometers from Porto Alegre, the state capital. The terrain is characterized by rolling hills and fertile plains, a legacy of ancient glacial activity. The Jacuí River flows nearby, influencing local humidity and providing a crucial waterway for regional transport and agriculture. São Jerônimo’s urban character is that of a provincial Brazilian town, with a central historic district radiating outwards into residential areas. The surrounding landscape is dominated by extensive agricultural lands, primarily dedicated to rice cultivation and livestock farming. This agricultural intensity is a key factor influencing air quality. While not heavily industrialized itself, São Jerônimo’s proximity to larger industrial centers further north introduces potential for long-range pollutant transport. The urban-rural gradient is relatively sharp, with agricultural fields bordering the city limits. This proximity means that seasonal burning of agricultural residue can directly impact local air quality, particularly during the dry season. The prevailing winds, generally from the northeast, can carry pollutants from these sources into the city center, affecting respiratory health.

São Jerônimo experiences a humid subtropical climate, with distinct seasonal variations impacting air quality. The summer months (December-February) are typically hot and humid, with frequent thunderstorms. While rainfall helps to cleanse the air, stagnant air masses can trap pollutants, particularly from agricultural activities. Autumn (March-May) brings milder temperatures and a decrease in rainfall, often leading to increased concentrations of particulate matter from harvest-related burning. This is a period when sensitive individuals should limit strenuous outdoor activity. Winter (June-August) is the coolest and driest season, often characterized by temperature inversions. These inversions trap pollutants near the ground, exacerbating air quality issues, especially from residential wood burning for heating. Fog is also common, further reducing visibility and trapping pollutants. Spring (September-November) sees a gradual warming trend and increasing rainfall, generally improving air quality. However, the preparation of fields for planting can again lead to localized burning. For those with respiratory conditions, avoiding outdoor exertion during calm, dry periods in winter and autumn is advisable. Monitoring local conditions and staying indoors when air quality is poor is crucial for protecting health.