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Votuporanga, nestled in the northwestern region of São Paulo state, Brazil, occupies a gently undulating terrain characteristic of the Paraná sedimentary basin. Located at coordinates -20.4228, -49.9728, the city’s elevation averages around 550 meters above sea level, contributing to relatively stable atmospheric conditions. The surrounding landscape is dominated by agricultural lands, primarily sugarcane and soybean cultivation, interspersed with patches of *cerrado* vegetation – a tropical savanna biome. The Rio Pardo, a significant tributary of the Tietê River, flows near Votuporanga, influencing local humidity and potentially contributing to localized fog formation. While not directly within a major industrial belt, the city benefits from regional economic activity linked to agribusiness and processing industries in nearby areas like Rio Preto. The urban-rural gradient is relatively sharp, with a noticeable transition from denser urban areas to expansive agricultural fields. This proximity to agricultural activities is a key factor influencing air quality, as seasonal burning for land preparation and pesticide application can release particulate matter and volatile organic compounds. The city’s position within a broader agricultural region means it’s susceptible to long-range transport of pollutants from surrounding areas, impacting baseline air quality levels. The prevailing winds, generally from the south-southeast, play a crucial role in dispersing or concentrating these pollutants.

Votuporanga experiences a distinct wet and dry season, rather than traditional four seasons. Air quality generally improves during the wet season (October to April) due to rainfall effectively scavenging pollutants from the atmosphere. The increased humidity also suppresses dust and particulate matter. However, the wet season can also bring localized flooding, potentially releasing contaminants from agricultural runoff. The dry season (May to September) consistently presents the poorest air quality. This is largely due to increased agricultural burning for sugarcane harvesting and land preparation, releasing significant amounts of smoke and particulate matter. Temperature inversions, common during the cooler, drier months, trap pollutants near the ground, exacerbating the problem. August and September are typically the months with the most noticeable air quality decline. Sensitive groups – children, the elderly, and individuals with respiratory conditions – should limit strenuous outdoor activity during these periods. The prevailing southerly winds during the dry season can also transport smoke from distant agricultural fires into the city. Monitoring wind patterns is crucial for predicting pollution episodes. Even during the wet season, periods of calm winds can lead to localized pollutant build-up, requiring vigilance.