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Sete Lagoas, nestled in the central region of Minas Gerais, Brazil, occupies a strategic position within the Belo Horizonte Metropolitan Region, approximately 70 kilometers northwest of the state capital. The city's name, meaning 'Seven Lakes,' reflects its distinctive geography, characterized by a series of natural and artificial lakes that punctuate the urban landscape, including Lagoa Paulino and Lagoa da Boa Vista. Situated at an elevation of around 760 meters above sea level on the Brazilian Highlands, the terrain is marked by rolling hills and plateaus, contributing to a moderate climate. This elevated setting, however, can trap pollutants under certain meteorological conditions, particularly during temperature inversions in the cooler months. The city lies within an important agricultural and industrial belt, with surrounding areas dedicated to dairy farming, coffee cultivation, and mining activities, the latter being a hallmark of Minas Gerais. Proximity to major highways like BR-040 facilitates transportation but also introduces vehicular emissions. The urban-rural gradient is pronounced, with the city center exhibiting denser development and peripheral zones transitioning to farmland. While the lakes provide some local humidity, they are not large enough to significantly disperse pollutants. Sete Lagoas's location in a valley-like basin can exacerbate air stagnation, especially when winds from the southeast are weak, allowing particulate matter from urban traffic, residential burning, and nearby industrial operations to accumulate, impacting air quality despite its relatively small population.

In Sete Lagoas, air quality follows a seasonal rhythm influenced by the city's subtropical highland climate, with distinct patterns across the year. During the austral summer (December to February), increased rainfall from convective storms helps cleanse the atmosphere, reducing pollutant levels and making this period favourable for outdoor activities, though occasional heatwaves can elevate ozone formation. Autumn (March to May) sees a gradual decline in precipitation, leading to drier conditions that allow dust and particulate matter to accumulate, especially from agricultural practices and road dust, with May often marking the onset of poorer air quality. Winter (June to August) is the peak pollution season, characterized by cooler temperatures, lower humidity, and frequent temperature inversions that trap pollutants near the ground; calm winds and reduced vertical mixing exacerbate issues from vehicular emissions and residential heating, making these months less ideal for sensitive groups like children, the elderly, and those with respiratory conditions. Spring (September to November) brings a transition, with rising temperatures and occasional rain showers starting to disperse pollutants, though early spring can still experience haze from biomass burning in surrounding areas. Sensitive individuals should monitor local air quality reports, avoid strenuous outdoor activities during winter mornings when inversions are common, and consider using masks on high-pollution days, while planning visits in summer or late spring for cleaner air.