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Borda da Mata, nestled within the state of Minas Gerais, Brazil, occupies a geographically significant position within the southeastern region. Located at approximately -22.2739 latitude and -46.1650 longitude, the city sits within a gently undulating landscape characteristic of the Serra da Mantiqueira foothills. The surrounding terrain is a mosaic of rolling hills, pastureland, and remnants of Atlantic Forest, a biome increasingly fragmented across Brazil. Its elevation, around 850 meters above sea level, contributes to a cooler climate compared to lower-lying areas of Minas Gerais, but also influences atmospheric stability, potentially exacerbating pollution events. The city’s proximity to larger urban centers like São Paulo, though not immediately adjacent, places it within the broader sphere of regional industrial activity and transportation corridors. Agriculture, particularly cattle ranching and soybean cultivation, is prevalent in the surrounding rural areas, introducing potential sources of particulate matter and ammonia into the atmosphere. The urban–rural gradient is relatively gradual, with smaller agricultural holdings interspersed amongst residential areas. The lack of major rivers directly bordering Borda da Mata means humidity levels are generally lower than coastal regions, impacting atmospheric mixing and pollutant dispersion. The prevailing winds, often influenced by the topography of the Serra da Mantiqueira, can trap pollutants within the valley, particularly during periods of low wind speed. This combination of topography, agricultural practices, and regional connectivity creates a unique environmental context for air quality in Borda da Mata.

Borda da Mata’s tropical savanna climate dictates a distinct wet and dry season pattern, profoundly influencing its air quality. The dry season, typically spanning from April to September, is characterized by lower rainfall and increased sunshine hours. This period often sees a build-up of pollutants due to reduced atmospheric cleansing by precipitation. Temperature inversions, common during the cooler nights of the dry season, trap cooler air near the ground, preventing the vertical dispersion of pollutants released from agricultural burning (a common practice for land clearing) and any localized industrial activity. The wet season, from October to March, brings increased rainfall and higher humidity, naturally scrubbing the atmosphere and reducing particulate matter concentrations. However, heavy rainfall can also lead to increased levels of ozone, formed through photochemical reactions involving water vapor and pollutants. Fog, occasionally occurring during the cooler months, can further exacerbate air quality issues by trapping pollutants close to the ground. Outdoor activities are generally more favorable during the wet season, particularly from November to February. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the dry season, especially on days with stagnant air or visible smoke from agricultural burning. While the wet season offers respite, pollen counts can rise during the transition periods, impacting those with allergies. The interplay of these seasonal meteorological factors creates a dynamic air quality profile for Borda da Mata, requiring ongoing monitoring and targeted public health advisories.