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Fortaleza dos Nugeiras, nestled in the state of Maranhão, Brazil, occupies a geographically significant position within the Cerrado biome, a vast tropical savanna ecoregion. Located at approximately -6.9639 latitude and -46.1769 longitude, the town’s terrain is characterized by gently undulating plains, typical of the Maranhão countryside, with scattered rocky outcrops and sparse vegetation. The surrounding landscape is dominated by the Cerrado’s characteristic gallery forests, following the courses of seasonal streams and rivers, and expansive grasslands punctuated by isolated trees. While not directly adjacent to a major river, the region’s hydrology is influenced by the Tocantins River basin, contributing to the area’s climate and potential for localized humidity. The urban–rural gradient around Fortaleza dos Nugeiras is relatively sharp; the town itself is small, with a population of just over 12,000, transitioning quickly into agricultural lands and the wider Cerrado ecosystem. The elevation is relatively low, averaging around 150 meters above sea level, which can influence air circulation patterns. The proximity to agricultural zones, particularly those employing conventional farming practices, introduces potential sources of particulate matter and volatile organic compounds. The town’s location within the Cerrado, while ecologically rich, also means it experiences the characteristic dry season winds that can transport dust and pollutants from distant sources, impacting local air quality. The lack of significant industrial activity within the immediate vicinity mitigates some pollution risks, but regional agricultural practices remain a key factor.

Fortaleza dos Nugeiras experiences a tropical savanna climate, defined by distinct wet and dry seasons rather than the four traditional seasons. The dry season, typically spanning from June to September, presents the most significant air quality challenges. During this period, reduced rainfall and increased temperatures lead to drier vegetation and soil, creating conditions ripe for dust storms. Strong, persistent winds, common during the dry season, readily lift and transport fine particulate matter across the landscape, significantly impacting air quality. Temperature inversions, though less frequent than in colder climates, can occasionally occur, trapping pollutants near the ground. The wet season, from October to May, brings increased rainfall and higher humidity, which naturally washes pollutants from the atmosphere and suppresses dust generation. However, agricultural activities intensify during the wet season, potentially releasing ammonia and other agricultural emissions. The months of July and August are generally the most challenging for air quality, with elevated particulate levels. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should limit prolonged outdoor activity during these months, particularly during periods of high wind. The transition months of May and September see fluctuating conditions, requiring vigilance. While the wet season offers a respite, occasional periods of fog can trap pollutants, creating localized air quality concerns. Maintaining awareness of regional weather patterns and agricultural practices is crucial for managing potential air quality impacts throughout the year.