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Palestina, nestled in the state of São Paulo, Brazil, at coordinates -20.3900, -49.4328, is a small municipality characterized by a gently undulating terrain typical of the state’s interior. The city’s elevation, approximately 560 meters above sea level, influences local meteorological conditions and pollutant dispersion. Palestina is situated within a broader agricultural zone, primarily dedicated to sugarcane and cattle farming, which contributes to particulate matter from field preparation and livestock. The surrounding landscape is a mosaic of agricultural land interspersed with remnants of the Mata Atlântica forest, though significant deforestation has occurred. The urban-rural gradient is relatively sharp, with the small city centre quickly transitioning to rural landscapes. The Rio Turvo, a significant waterway, flows nearby, potentially influencing humidity and localized air circulation patterns. While Palestina isn’t directly within a major industrial belt, its proximity to larger urban centres like Ribeirão Preto means it can experience the effects of regional pollution transport. The prevailing winds, generally from the south-southeast, play a crucial role in dispersing or concentrating pollutants depending on atmospheric stability. The city’s limited infrastructure and reliance on vehicle transport further contribute to localised emissions, impacting air quality within the urban core.

Palestina 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 scavenging pollutants from the atmosphere and increased humidity suppressing dust. However, the increased humidity can also foster mold growth, impacting respiratory health. The dry season (May to September) consistently presents poorer air quality. This is largely due to increased agricultural activity – sugarcane burning, though increasingly regulated, still occurs, releasing significant particulate matter. Lower humidity and stable atmospheric conditions during these months exacerbate pollutant concentrations, leading to reduced visibility and increased respiratory irritation. August and September are typically the worst months for air quality. Temperature inversions, common during the cooler dry season nights, trap pollutants near the ground. Sensitive groups, including children, the elderly, and individuals with pre-existing respiratory conditions, should limit strenuous outdoor activity during the dry season, particularly on calm, clear days. Monitoring wind patterns is crucial; winds from agricultural areas will carry higher pollutant loads. Staying indoors with windows closed during peak pollution periods is advisable.