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Miranorte, nestled in the heart of Tocantins, Brazil, at coordinates -9.5289, -48.5900, presents a unique geographic profile influencing its air quality. The city sits within the Cerrado biome, a vast tropical savanna ecoregion characterized by undulating terrain and scattered woodlands. Elevation is relatively low, contributing to limited natural dispersion of pollutants. Miranorte’s urban character is that of a developing agricultural service centre, supporting the surrounding agricultural lands. The Araguaia River lies to the west, a significant waterway but not immediately adjacent, meaning its influence on local air currents is moderate. The surrounding landscape is dominated by extensive agricultural zones, primarily soybean and cattle ranching, which are key economic drivers but also potential sources of particulate matter from land clearing and agricultural practices. The urban-rural gradient is sharp; Miranorte is a relatively small city surrounded by large expanses of farmland. This proximity means that agricultural burning, a common practice for land preparation, directly impacts air quality within the city limits. The lack of significant industrial belts within Miranorte itself shifts the focus of pollution sources to these agricultural activities and vehicle emissions within the growing urban area. Topography offers little in the way of natural barriers to pollutant dispersal, making the city vulnerable to regional air quality fluctuations.

Miranorte experiences a distinct wet and dry season, heavily influencing air quality. The dry season, typically from May to September, is when air quality concerns peak. Reduced rainfall means less atmospheric cleansing, and agricultural burning for land preparation is most prevalent during this period, releasing significant amounts of particulate matter (PM2.5 and PM10). Lower humidity also contributes to increased dust suspension. August and September are generally the months with the poorest air quality. Conversely, the wet season, from October to April, brings relief. Frequent rainfall effectively washes pollutants from the atmosphere, and higher humidity suppresses dust. November to February generally offer the best air quality. Temperature inversions, common during the cooler dry season nights, can trap pollutants near ground level, exacerbating conditions. Wind patterns, generally from the southeast, can transport smoke from burning areas directly over the city. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit strenuous outdoor activity during the dry season, particularly in August and September. Monitoring local fire reports and staying indoors on smoky days is crucial. The wet season provides a window for improved respiratory health and increased outdoor activity.