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Aragarças, Goiás, nestled in the Brazilian Cerrado biome, presents a unique geographic profile significantly influencing its air quality. Situated on the banks of the Paranaíba River, which forms a natural border with Mato Grosso do Sul state, the city’s location is characterized by a gently undulating terrain, averaging around 330 meters above sea level. The surrounding landscape is dominated by the Cerrado’s characteristic savanna vegetation – a mosaic of grasslands, shrubs, and gallery forests along the river. This region is undergoing rapid agricultural expansion, with soybean and maize cultivation being prominent, contributing to potential dust and pesticide drift. Aragarças’ position within the larger Goiás state places it within a transitional zone between the more humid east and the drier west, impacting rainfall patterns and evaporation rates. The urban fabric is relatively compact, a small municipality experiencing growth driven by agriculture and river trade. While not directly adjacent to major industrial belts, the city serves as a logistical hub for agricultural products destined for larger urban centers, leading to increased truck traffic along federal highways. The urban–rural gradient is relatively sharp, with agricultural land quickly encroaching upon the city limits. The Paranaíba River itself, while providing a vital water source, can also contribute to localized humidity and fog formation, potentially trapping pollutants under certain meteorological conditions. The prevailing winds, generally from the east during the wet season, play a crucial role in dispersing or concentrating airborne particles.

Aragarças experiences a tropical savanna climate, defined by distinct wet and dry seasons, profoundly impacting its air quality dynamics. The dry season, typically from May to September, is characterized by lower rainfall and higher temperatures, often accompanied by periods of intense heat. This leads to increased evaporation from agricultural fields, generating significant dust emissions, particularly during land clearing and tillage activities. The lack of rainfall also reduces the natural cleansing effect of precipitation, allowing particulate matter to accumulate. Temperature inversions, common during the cooler nights of the dry season, can trap pollutants near the ground, exacerbating localized air quality issues. Conversely, the wet season (October to April) brings frequent rainfall and higher humidity. While the rain helps to wash away pollutants, the increased humidity can contribute to the formation of ground-level ozone under sunny conditions, especially during periods of intense agricultural activity involving pesticide application. Fog, frequently occurring along the Paranaíba River, can also trap pollutants, reducing visibility and impacting air quality. The months of July and August, coinciding with peak dry season and agricultural activity, are generally periods to exercise caution for individuals with respiratory sensitivities. During the wet season, particularly after prolonged dry spells, the initial rainfall can stir up dust before the air clears. Sensitive groups, including children, the elderly, and those with pre-existing respiratory conditions, should monitor local conditions and limit outdoor exertion during periods of elevated dust or ozone levels.