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Jaguariúna, nestled in the state of São Paulo, Brazil, occupies a gently undulating terrain within the broader Piracicaba River Valley. Located at approximately 620 meters above sea level, the city benefits from a moderate elevation that influences local weather patterns. Its coordinates (-22.6800, -46.9900) place it within a region characterized by a transition between the Atlantic Forest biome and agricultural landscapes. The Piracicaba River, a vital waterway, flows nearby, impacting humidity levels and potentially contributing to localized temperature inversions. Jaguariúna’s urban character is evolving, exhibiting a blend of residential areas, commercial zones, and increasingly, light industrial activity. Surrounding the city is a significant agricultural belt, primarily focused on sugarcane and citrus cultivation, which introduces seasonal burning practices. The urban-rural gradient is relatively sharp, with agricultural lands directly abutting the city limits. This proximity means that air quality is heavily influenced by agricultural emissions, alongside vehicle exhaust and industrial processes. The city’s position downwind of larger industrial centers in the São Paulo metropolitan area also means it can receive transported pollutants. Understanding these geographical factors is crucial for assessing and mitigating air quality challenges in Jaguariúna.

Jaguariúna experiences a tropical climate with distinct wet and dry seasons, profoundly impacting air quality. The dry season, typically from May to September, sees a significant increase in particulate matter due to agricultural burning associated with sugarcane harvesting. Lower humidity and stable atmospheric conditions during these months exacerbate pollution, trapping pollutants near the ground. August and September are often the most challenging months for respiratory health. Conversely, the wet season (October to April) brings relief, with rainfall effectively washing pollutants from the atmosphere. However, even during the wet season, localized pollution from vehicle traffic and industrial sources persists. Temperature inversions, common during cooler nights, can trap pollutants at ground level regardless of the season. Fog, particularly in the mornings during the cooler months, can also concentrate pollutants. Sensitive groups – children, the elderly, and those with pre-existing respiratory conditions – should limit strenuous outdoor activity during the dry season and periods of fog. Monitoring wind patterns is crucial; winds from the southeast can carry pollutants from the heavily industrialized Campinas region. Overall, the wet season offers the most favourable conditions for outdoor activity.