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Anicuns, Goiás, nestled in the Brazilian Cerrado biome, presents a unique geographic profile influencing its air quality. Located at approximately -16.4608° latitude and -49.9619° longitude, the city sits at an elevation of roughly 430 meters (1,411 feet) above sea level, contributing to a relatively open atmospheric mixing layer. The surrounding landscape is dominated by the characteristic Cerrado vegetation – a savanna-like ecosystem with vast grasslands interspersed with gallery forests along seasonal streams. This vegetation, while generally beneficial for carbon sequestration, can also contribute to particulate matter during the dry season through natural wildfires and agricultural burning. Anicuns is part of the larger Goiana region, an area experiencing rapid agricultural expansion, particularly soybean and maize cultivation. This proximity to intensive agricultural zones introduces potential sources of air pollution, including pesticide drift and emissions from farm machinery. The urban–rural gradient around Anicuns is relatively sharp, with agricultural land quickly transitioning to residential and commercial areas. While not directly adjacent to major rivers, the city relies on groundwater and seasonal streams, impacting local humidity and potentially influencing fog formation, which can trap pollutants. The regional climate, characterized by a distinct wet and dry season, significantly impacts atmospheric stability and dispersion patterns, creating conditions that can either dilute or concentrate pollutants depending on the time of year. The absence of significant industrial belts within Anicuns itself means that local pollution is primarily driven by agricultural activities, vehicle emissions, and residential wood burning.

Anicuns experiences a tropical savanna climate, dictating a clear wet (November to April) and dry (May to October) season cycle that profoundly shapes its air quality. The dry season, stretching from May to October, typically sees a marked increase in particulate matter. This is largely attributable to agricultural burning practices – a common method for land clearing and crop residue disposal. Reduced rainfall and lower humidity during this period also contribute to the persistence of these particles. Temperature inversions, more frequent during the cooler, drier months (June-August), can trap pollutants near the ground, exacerbating the issue. Conversely, the wet season brings increased rainfall, which naturally washes pollutants from the atmosphere, leading to improved air quality. Higher humidity also promotes the deposition of particulate matter. Fog, occasionally forming during the transition periods between seasons, can temporarily reduce visibility and trap pollutants, particularly in low-lying areas. During the wet season (November-April), outdoor activities are generally more favorable, although heavy rainfall can still impact visibility. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the dry season, particularly on days with visible smoke or haze. Agricultural workers are at heightened risk during burning periods and should utilize appropriate respiratory protection. The transition months (April/May and October/November) can be unpredictable, with periods of both improved and degraded air quality, requiring vigilance and awareness of local conditions.