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Nova Crixás, nestled in the state of Goiás, Brazil, occupies a unique position within the Cerrado biome, a vast tropical savanna ecoregion. Located at coordinates -14.0989, -50.3269, the city sits on relatively flat terrain, typical of the region, at an elevation of approximately 800 meters. This altitude influences temperature patterns and atmospheric circulation. The surrounding landscape is predominantly characterized by Cerrado vegetation – open woodlands, grasslands, and scattered trees – transitioning into agricultural lands, primarily soybean and corn cultivation, as one moves away from the urban core. The Araguaia River, a major tributary of the Amazon, lies approximately 60 kilometers to the west, exerting a limited but noticeable influence on local humidity. While Nova Crixás isn’t directly adjacent to major industrial belts, the increasing agricultural intensification and associated use of fertilizers and pesticides contribute to potential air quality concerns. The urban-rural gradient is relatively sharp, with a rapid transition from residential areas to agricultural fields. Dust from agricultural activities, particularly during dry periods, is a significant factor. The city’s relatively small population of 12,815 means emissions from vehicular traffic are less dominant than in larger urban centers, but still contribute to localized pollution. The Cerrado’s fire regime, both natural and anthropogenic, also plays a crucial role in seasonal air quality variations.

Nova Crixás experiences a distinct wet and dry season, heavily influencing air quality. The dry season, typically from May to September, is characterized by lower humidity and increased dust resuspension from agricultural lands. This period often sees the highest levels of particulate matter, especially PM10, due to agricultural practices and potential controlled burns for land clearing. August and September are generally the months with the poorest air quality, posing risks to individuals with respiratory conditions. Conversely, the wet season, from October to April, brings relief through rainfall which effectively washes away pollutants and suppresses dust. However, the increased humidity can also contribute to the formation of mold and fungal spores, potentially exacerbating allergies. November and December typically offer the clearest air. Temperature inversions, common during the cooler nights of the dry season, can trap pollutants near the ground, worsening air quality. Local wind patterns, generally from the southeast, can transport pollutants from agricultural areas into the city. Sensitive groups – children, the elderly, and those with pre-existing respiratory illnesses – should limit strenuous outdoor activity during the dry season and monitor their health closely. The transition months of April and October can be unpredictable, requiring vigilance.