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Ubaporanga, nestled in the southern reaches of Minas Gerais, Brazil, occupies a geographically significant position within the broader Cerrado biome and the transition zone to the Atlantic Forest. Located at approximately -19.6350° latitude and -42.1058° longitude, the city sits at an elevation of roughly 650 meters above sea level, contributing to a relatively mild climate. The surrounding landscape is characterized by undulating plains and gently sloping hills, typical of the southern Cerrado, interspersed with patches of gallery forest along small streams and rivers. This terrain influences local wind patterns, often channeling breezes through the urban area. Ubaporanga’s proximity to the São Francisco River, though not directly on its banks, means the region benefits from its broader hydrological influence, impacting humidity levels and potentially affecting atmospheric stability. The city’s urban fabric is relatively compact, reflecting its smaller population of around 13,000. Economically, Ubaporanga is linked to the wider Minas Gerais mining belt, with agricultural activities, particularly cattle ranching and soybean cultivation, also playing a role in the regional economy. This agricultural activity, combined with potential mining operations in the surrounding area, introduces sources of particulate matter and gaseous pollutants. The urban–rural gradient is gradual, with smaller settlements and agricultural land extending outwards, influencing the dispersion of pollutants and creating a complex interplay between urban and rural air quality dynamics. The local topography and prevailing winds dictate how pollutants from these sources are transported and diluted within the Ubaporanga airshed.

Ubaporanga experiences a tropical savanna climate, characterized by distinct wet and dry seasons, significantly impacting air quality patterns. The dry season, typically spanning from April to September, is often associated with increased particulate matter concentrations. Reduced rainfall and lower humidity during this period lead to drier vegetation and soil, increasing the risk of dust storms and wildfires, both major contributors to air pollution. Temperature inversions, common during the cooler, drier months, trap pollutants near the ground, exacerbating the problem. Conversely, the wet season (October to March) brings frequent rainfall, which naturally cleanses the atmosphere by washing away particulate matter and diluting gaseous pollutants. Higher humidity also reduces dust generation. However, intense rainfall events can lead to soil erosion and runoff, carrying pollutants into waterways and potentially impacting air quality through resuspension. The months of August and September often see the highest levels of particulate matter due to a combination of dry conditions, agricultural activities (harvesting), and the increased risk of controlled burns. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should limit outdoor exertion during these periods. During the wet season, while overall air quality improves, heavy rainfall can still trigger localized flooding and associated mold growth, impacting indoor air quality. Maintaining good ventilation and addressing moisture issues are crucial during this time. The interplay of these seasonal factors creates a dynamic air quality profile for Ubaporanga, requiring ongoing monitoring and targeted public health advisories.