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Betim is a significant industrial city located in the southeastern Brazilian state of Minas Gerais, positioned approximately 30 kilometers west of Belo Horizonte within the Greater Belo Horizonte metropolitan region. Situated at an elevation of around 830 meters above sea level in the Brazilian Highlands, the city occupies a transitional zone between the Serra do Espinhaço mountain range to the north and the rolling hills of the Central Plateau. This topography creates a basin-like effect that can trap pollutants, particularly during periods of atmospheric stability. Betim lies near the Paraopeba River, a tributary of the São Francisco River, though this proximity provides minimal air cleansing effects given the river's modest flow through the urban area. The city forms part of Brazil's most important industrial corridor, with extensive manufacturing facilities including the Fiat automobile plant—one of Latin America's largest—alongside steel production, petrochemical operations, and cement manufacturing that collectively dominate the local economy. This industrial concentration creates a distinct urban-rural gradient where eastern sections near industrial zones experience significantly poorer air quality compared to western residential areas that gradually transition into agricultural lands producing coffee, dairy, and eucalyptus. The city's geographic position within the densely populated Minas Gerais industrial heartland means it receives both locally generated pollution and regional transport of contaminants from neighboring municipalities, exacerbated by frequent temperature inversions that develop in the valley-like terrain.

Betim experiences distinct seasonal air quality patterns influenced by its tropical savanna climate with dry winters and rainy summers. During the austral winter from June to August, pollution reaches its annual peak as stable atmospheric conditions prevail with frequent temperature inversions that trap industrial emissions and vehicle exhaust near ground level. These months feature minimal precipitation, allowing particulate matter to accumulate over weeks, while cool morning temperatures combine with light winds to create persistent haze that typically clears only partially by afternoon. Sensitive groups including children, elderly residents, and those with respiratory conditions should limit outdoor activity during morning hours in these months. The spring transition from September to November brings gradually improving conditions as increasing temperatures break up inversion layers and occasional pre-monsoon showers begin cleansing the atmosphere. Summer from December to February offers the cleanest air despite higher temperatures, as daily afternoon thunderstorms and consistent southeasterly winds effectively disperse pollutants, making this the optimal season for outdoor activities. Autumn from March to May sees a gradual deterioration in air quality as rainfall decreases and atmospheric stability increases, though conditions remain better than winter months. Throughout the year, industrial emissions remain relatively constant, meaning meteorological factors primarily drive pollution variability, with the dry season's atmospheric stagnation posing the greatest health risk, particularly for those living near major industrial zones.