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São Luís de Montes Belos, nestled in the state of Goiás, Brazil, occupies a unique geographic position within the Cerrado biome. The city sits at an elevation of approximately 830 meters (2,723 feet) above sea level, contributing to a relatively stable atmospheric layer. The surrounding landscape is characterized by the typical Cerrado savanna – undulating plains punctuated by gallery forests along river courses. The Rio das Almas, a significant tributary of the Araguaia-Tocantins basin, flows nearby, influencing local humidity and potentially contributing to localized fog formation. While not heavily industrialized, the region is increasingly influenced by agricultural expansion, particularly soybean and corn cultivation, which introduces particulate matter from land preparation and harvesting. The urban-rural gradient is fairly sharp; the city itself is a relatively compact settlement surrounded by extensive agricultural lands and native Cerrado vegetation. This proximity to agricultural activity is a key factor in understanding the city’s air quality profile. Dust from agricultural practices, combined with seasonal burning for land clearing, can significantly impact local air quality. The terrain, while not mountainous, offers limited natural dispersion of pollutants, especially during periods of atmospheric stability. The city’s location within the Cerrado also means it experiences distinct wet and dry seasons, impacting pollutant concentrations.

São Luís de Montes Belos experiences a pronounced wet and dry season, heavily influencing air quality. The dry season, typically from May to September, is characterized by lower humidity and increased dust levels from agricultural activities. This period often sees the highest concentrations of particulate matter (PM10 and PM2.5) due to land preparation for planting and potential controlled burns for pasture renewal. August and September are generally the months with the poorest air quality. Conversely, the wet season, from October to April, brings relief through rainfall which effectively washes pollutants from the atmosphere. However, the increased humidity can also contribute to the formation of mold spores, potentially impacting respiratory health. November to February are typically the months with the best air quality. Temperature inversions, common during the cooler dry season nights, trap pollutants near the ground, exacerbating air quality issues. Wind patterns, generally from the south-east, can transport pollutants from agricultural areas towards the city. Sensitive groups – children, the elderly, and individuals with respiratory conditions – should limit strenuous outdoor activity during the dry season, particularly in August and September. Monitoring local weather reports and avoiding peak agricultural activity periods is advisable.