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Pires do Rio, nestled in the state of Goiás, Brazil, occupies a strategically important position within the Cerrado biome, a vast tropical savanna ecoregion. Located at approximately -17.3008° latitude and -48.2800° longitude, the city’s elevation averages around 450 meters above sea level, contributing to a generally mild climate. The surrounding landscape is characterized by undulating plains punctuated by gallery forests along seasonal streams and rivers, a typical feature of the Cerrado. Pires do Rio sits within a region experiencing a gradual urban–rural gradient; while the city itself is a growing urban center, it’s bordered by extensive agricultural lands, primarily dedicated to soybean and maize cultivation, alongside cattle ranching. This agricultural activity, coupled with the increasing road traffic associated with transporting produce, represents a significant potential source of air pollutants. The city’s proximity to the larger urban centers of Goiânia and Brasília, roughly 200 kilometers away, also influences its air quality, as regional transport patterns can carry pollutants across considerable distances. The terrain, while generally flat, can experience localized variations that influence wind patterns and the dispersion of pollutants. The lack of significant bodies of water within immediate proximity limits natural air purification processes, potentially exacerbating pollution episodes. The region’s geology, dominated by Precambrian crystalline rocks, doesn't contribute significantly to air pollution, but the soil composition influences agricultural practices and, consequently, dust generation.

Pires do Rio experiences a tropical savanna climate, defined by distinct wet and dry seasons, profoundly impacting its air quality. The dry season, typically spanning from May to September, is characterized by lower rainfall and higher temperatures, often accompanied by periods of intense sunshine. This period frequently sees a build-up of pollutants due to reduced atmospheric cleansing through precipitation. Temperature inversions, common during the cooler nights of the dry season, trap pollutants near the ground, leading to elevated concentrations, particularly of particulate matter. Agricultural burning, a practice sometimes employed for land clearing and crop residue management, is most prevalent during this time, significantly contributing to smoke and haze. The wet season, from October to April, brings increased rainfall and higher humidity, naturally dispersing pollutants and improving air quality. However, heavy rainfall can also lead to increased soil erosion and dust generation, particularly on agricultural lands, temporarily impacting air quality. Fog, though infrequent, can occur during the transition periods between seasons, trapping pollutants and reducing visibility. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the dry season, particularly during periods of agricultural burning. Limiting outdoor exertion and avoiding areas with visible smoke are advisable. During the wet season, while generally cleaner, periods of intense dust storms should also be approached with similar precautions.