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Mineiros, nestled in the state of Goiás, Brazil, occupies a unique geographic position within the Cerrado biome, a vast tropical savanna. Located at coordinates -17.5689, -52.5508, the city sits on relatively flat terrain, typical of the region, at an elevation of approximately 830 meters. This elevation moderates temperatures somewhat, but doesn’t eliminate the influence of the tropical climate. The surrounding landscape is predominantly agricultural, dominated by soybean, corn, and sugarcane cultivation, alongside extensive cattle ranching. The Araguaia River lies approximately 60 kilometers to the north, influencing regional humidity but not directly impacting the city’s immediate microclimate. Mineiros functions as a regional hub for agricultural processing and distribution, leading to localized transport-related emissions. The urban-rural gradient is quite sharp; the city centre is densely populated, transitioning rapidly to expansive agricultural lands. This proximity to large-scale farming introduces potential for particulate matter from land preparation, harvesting, and the use of agricultural chemicals. Dust from unpaved roads, common in the surrounding areas, also contributes to baseline particulate levels. The city’s location within the Cerrado also means it’s susceptible to seasonal wildfires, a significant source of air pollution during drier periods. The relatively flat topography can also contribute to pollutant stagnation during calm weather conditions.

Mineiros experiences a distinct wet and dry season, rather than traditional four seasons. Air quality in Mineiros is most compromised during the dry season (May to September). This period sees reduced rainfall, leading to increased dust resuspension from agricultural activities and unpaved roads. The lack of precipitation also hinders the natural cleansing of the atmosphere. Agricultural burning, used for land clearing and crop residue management, is most prevalent during these months, releasing substantial amounts of particulate matter and other pollutants. October and November mark the transition to the wet season, with intermittent rainfall offering some improvement in air quality. The wet season (December to April) generally offers the best air quality, as rainfall effectively washes pollutants from the atmosphere. However, even during the wet season, localized pollution from vehicle emissions and agricultural processing can occur. Temperature inversions, common during cooler nights, can trap pollutants near ground level, exacerbating conditions. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit strenuous outdoor activity during the dry season, particularly when agricultural burning is reported. Monitoring wind patterns is crucial; winds from agricultural areas can bring plumes of smoke and dust into the city.