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Nossa Senhora do Livramento, nestled in the state of Mato Grosso, Brazil, occupies a geographically significant position within the Cerrado biome, a vast tropical savanna ecoregion. Located approximately 75 kilometers south of Cuiabá, the state capital, the city’s coordinates (-15.7750, -56.3458) place it on gently undulating terrain, characterized by rolling hills and fertile plains. The elevation averages around 530 meters above sea level, contributing to a relatively moderate climate. The surrounding landscape is dominated by expansive agricultural lands, primarily dedicated to soybean and cattle farming – a defining feature of the region’s economy. This proximity to intensive agricultural zones is a crucial factor influencing local air quality, with potential for dust emissions and agricultural byproduct burning. While not directly adjacent to major rivers, the region experiences seasonal rainfall, impacting humidity levels and atmospheric stability. The urban–rural gradient is relatively sharp; Nossa Senhora do Livramento itself is a small, primarily residential city, transitioning quickly into the agricultural expanse of the Cerrado. There are no major industrial belts immediately bordering the city, though Cuiabá’s industrial activity can occasionally influence regional air patterns. The city’s layout is relatively compact, with a central core and expanding residential areas, generally following the natural contours of the land. The prevailing winds, typically from the east during the wet season, play a role in dispersing pollutants, though localized inversions can trap them under certain conditions.

The air quality narrative for Nossa Senhora do Livramento is largely dictated by the region’s distinct wet and dry seasons. The dry season, typically spanning from April to September, presents the greatest air quality challenges. Reduced rainfall leads to drier soils, increasing the potential for windblown dust, particularly from agricultural fields undergoing tillage. Agricultural burning, a common practice for land clearing and crop residue removal, intensifies during this period, releasing significant particulate matter and gaseous pollutants. Temperature inversions are more frequent during the dry season, trapping pollutants near the ground, especially during calmer nights. The wet season, from October to March, brings increased rainfall and higher humidity, which generally helps to cleanse the atmosphere by washing away particulate matter and diluting gaseous pollutants. However, periods of intense rainfall can also lead to localized flooding and the release of mold spores, impacting air quality for sensitive individuals. The months of August and September often experience the poorest air quality due to a combination of dry conditions, agricultural burning, and stable atmospheric conditions. Individuals with respiratory conditions, such as asthma, and the elderly should exercise caution during these periods, limiting outdoor exertion and monitoring for symptoms. During the wet season, while overall air quality improves, those with allergies should be mindful of potential mold exposure. The interplay of wind patterns and rainfall dictates the daily fluctuations in air quality, with calmer days often resulting in higher pollutant concentrations.