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Macatuba, nestled in the state of São Paulo, Brazil, occupies a relatively flat portion of the inland plateau at coordinates -22.5022, -48.7114. The city’s terrain is gently undulating, characteristic of the broader Paulista Depression, a geological feature influencing regional drainage patterns. With a population of approximately 17,013, Macatuba exhibits a typical Brazilian interior city structure – a concentrated urban core surrounded by a transitioning urban-rural gradient dominated by extensive agricultural lands, primarily sugarcane and soybean cultivation. This agricultural intensity is a defining feature of the region, and a significant contributor to potential air quality concerns. The city isn’t directly adjacent to major bodies of water, though smaller rivers and streams dissect the landscape, influencing local humidity. Macatuba’s location isn’t within a heavily industrialized belt, but benefits from proximity to larger industrial centres in the state, meaning long-range transport of pollutants is possible. The prevailing winds, generally from the south-southeast, can carry pollutants from these areas. The lack of significant topographical barriers allows for relatively easy dispersion, but temperature inversions, particularly during calmer periods, can trap pollutants near ground level, exacerbating local air quality issues. The surrounding landscape offers limited natural filtration of airborne particles.

Macatuba experiences a tropical climate with distinct wet and dry seasons, heavily influencing its air quality. The dry season, typically from May to September, sees reduced rainfall and increased dust from agricultural activities – sugarcane harvesting and land preparation – leading to elevated particulate matter (PM10 and PM2.5) concentrations. Lower humidity also means pollutants are less likely to be washed out by rain. August and September are often the months with the poorest air quality. Conversely, the wet season, from October to April, brings frequent rainfall which effectively scrubs the atmosphere, resulting in cleaner air. However, increased humidity can also promote the formation of mold and allergens, impacting respiratory health. November and December generally offer the best air quality. Temperature inversions are more common during the cooler, drier months, trapping pollutants. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit strenuous outdoor activity during the dry season, particularly in the late afternoon when pollutant concentrations tend to peak. Monitoring wind patterns is crucial; winds from industrial areas to the south can bring increased pollution. Fog, though infrequent, can exacerbate particulate matter issues.