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João Monlevade, nestled in the heart of Minas Gerais, Brazil, occupies a geographically significant position within the Quadrilátero Ferrífero (Iron Quadrangle), a region renowned for its extensive iron ore deposits. Located at approximately -19.8100 latitude and -43.1736 longitude, the city sits at an elevation of around 750 meters (2,460 feet) above sea level, contributing to a generally cooler climate compared to lower-lying areas of Minas Gerais. The surrounding landscape is characterized by rolling hills and valleys, typical of the Brazilian Highlands, interspersed with remnants of the Cerrado savanna biome. This terrain influences local wind patterns, often creating localized areas of stagnant air, particularly during periods of atmospheric stability. The city’s urban character is that of a regional service center, supporting the mining industry and surrounding agricultural communities. While not directly adjacent to major rivers, it benefits from proximity to smaller streams and tributaries that feed into larger river systems, impacting regional hydrology. The urban–rural gradient transitions relatively quickly, with agricultural lands and smaller settlements dominating the periphery. The Iron Quadrangle’s industrial belt, centered around mining operations and related processing facilities, exerts a considerable influence on João Monlevade’s air quality, with potential emissions impacting the city’s atmosphere. The geological composition of the region, rich in iron and other minerals, also contributes to naturally occurring dust and particulate matter, further complicating air quality management.

João Monlevade experiences a tropical savanna climate, characterized by distinct wet and dry seasons rather than the four traditional seasons. The dry season, typically spanning from April to September, presents the most significant air quality challenges. During this period, reduced rainfall and lower humidity contribute to increased dust levels, exacerbated by mining activities and agricultural practices like controlled burns. Temperature inversions are more frequent during the dry season, trapping pollutants near the ground, particularly in the mornings and evenings. The lack of consistent wind circulation further compounds this issue, leading to a build-up of particulate matter and potentially gaseous pollutants. Conversely, the wet season (October to March) brings relief through frequent rainfall, which naturally washes pollutants from the atmosphere and increases ventilation. However, heavy rainfall can also lead to increased soil erosion and runoff, carrying particulate matter into waterways and potentially impacting air quality locally. Fog, while infrequent, can occur during cooler periods, trapping pollutants and reducing visibility. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the dry season, limiting outdoor activities during peak pollution hours. Agricultural burning, often practiced in the surrounding areas, can significantly degrade air quality, particularly in September and October. Monitoring local weather forecasts and air quality reports is crucial for informed decision-making regarding outdoor exposure.