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Crixás, Goiás, nestled within the Brazilian Cerrado biome, presents a unique geographic profile significantly influencing its air quality. Located at approximately -14.5489° latitude and -49.9689° longitude, the city sits at an elevation of around 430 meters (1,411 feet) above sea level, contributing to a relatively open atmospheric mixing layer. The surrounding landscape is dominated by the characteristic savanna vegetation of the Cerrado, a mosaic of grasslands, woodlands, and gallery forests, interspersed with gently undulating terrain. This biome, while naturally producing biogenic volatile organic compounds (BVOCs), also experiences seasonal burning practices for land clearing and agricultural expansion, a major source of particulate matter. Crixás’s position within the larger Goias state places it within a region undergoing rapid agricultural intensification, particularly soybean and maize cultivation, which introduces agricultural emissions and dust. The urban–rural gradient is relatively sharp, with agricultural lands quickly transitioning to the city’s periphery. While Crixás lacks significant proximity to major rivers, occasional rainfall events are crucial for atmospheric cleansing. The city’s location isn’t directly adjacent to established industrial belts, but it serves as a regional hub for agricultural processing and transportation, leading to localized emissions from vehicle traffic and smaller-scale industrial activities. The open nature of the Cerrado generally allows for good dispersion of pollutants, but specific weather patterns can trap emissions, exacerbating air quality challenges.

Crixás experiences a tropical savanna climate, characterized by distinct wet and dry seasons, profoundly impacting its air quality dynamics. The dry season, typically spanning from May to September, is the period of greatest concern. Reduced rainfall, coupled with higher temperatures and frequent occurrences of temperature inversions, traps pollutants near the ground. Agricultural burning, a common practice during this period to prepare fields for planting, releases substantial quantities of particulate matter and gases, significantly degrading air quality. Wind speeds tend to be lower during the dry season, further hindering pollutant dispersal. The months of July and August often see the most persistent and impactful episodes of elevated pollution. Conversely, the wet season, from October to April, brings relief through frequent rainfall, which effectively washes pollutants from the atmosphere. Increased humidity also reduces the formation of secondary pollutants. However, intense rainfall events can occasionally lead to flooding and the release of dust from exposed soil. Fog, though infrequent, can also occur during cooler periods, trapping pollutants and reducing visibility. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the dry season, limiting outdoor activities during peak burning periods and avoiding areas with visible smoke. Maintaining indoor air quality through proper ventilation and air filtration is also recommended. The transition months (April/May and September/October) often present a mixed picture, with fluctuating conditions requiring vigilance and awareness of local fire activity.