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Bernardino de Campos, a small municipality nestled in the state of São Paulo, Brazil, occupies a gently undulating terrain within the larger Paraná Basin. Located at approximately 560 meters above sea level, the city benefits from a moderate elevation that influences local climate patterns. The surrounding landscape is predominantly agricultural, characterized by extensive sugarcane and soybean cultivation, typical of the region’s fertile red soils. The Tatuí River flows nearby, providing a crucial water source but also potentially contributing to localized humidity and influencing pollutant dispersion. Bernardino de Campos is situated within a broader agricultural belt, with larger industrial centers like Bauru and Jaú within a 50-100km radius. This proximity introduces the potential for long-range transport of pollutants. The urban-rural gradient is quite sharp; the city itself is compact, transitioning rapidly into expansive farmland. This configuration means that prevailing winds can carry agricultural aerosols – dust, pesticides, and biomass burning emissions – directly over the urban area. The lack of significant natural barriers to wind flow, combined with the flat topography, can exacerbate pollutant concentrations during certain periods. The city’s small size limits its own industrial contribution to air pollution, making it more susceptible to regional influences.

Air quality in Bernardino de Campos follows a distinct seasonal pattern largely dictated by the wet and dry seasons typical of São Paulo’s interior. The dry season, spanning roughly May to September, witnesses the lowest rainfall and increased agricultural activity, particularly sugarcane harvesting and burning. This leads to a peak in particulate matter (PM2.5 and PM10) and volatile organic compounds (VOCs) from field burning, often exacerbated by stable atmospheric conditions and temperature inversions that trap pollutants near the ground. October and November bring the transition to the wet season, with increased rainfall gradually washing away accumulated pollutants and improving air quality. December to March represents the wettest period, generally offering the cleanest air due to rainfall scavenging and reduced agricultural burning. However, even during the wet season, localized pollution from vehicle emissions and small-scale domestic burning can occur. Sensitive groups – children, the elderly, and those with respiratory conditions – should be particularly cautious during the dry months. Fog, common in the cooler mornings, can also trap pollutants, worsening conditions locally. Avoiding strenuous outdoor activity during peak burning periods and monitoring local conditions is advisable.