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Cláudio, Minas Gerais, nestled within the southeastern Brazilian Cerrado biome, presents a unique geographic profile significantly influencing its air quality. Located at approximately -20.4428° S, -44.7658° W and an elevation of around 850 meters (2,789 feet) above sea level, the city occupies a gently undulating plateau characteristic of the southern Cerrado. The surrounding landscape is a mosaic of savanna grasslands, gallery forests lining small streams, and increasingly, agricultural land. This transition from natural Cerrado to cultivated fields creates an urban–rural gradient where agricultural practices, particularly soybean and maize cultivation, can contribute to particulate matter and ammonia emissions. Cláudio’s position within the broader Minas Gerais state places it within a region experiencing increasing industrial activity, though direct heavy industry within Cláudio itself is limited. However, proximity to larger industrial centers in the state’s metropolitan areas can lead to the advection of pollutants. The city is not directly adjacent to major rivers, but several smaller tributaries feed into larger river systems, influencing local humidity and potentially affecting the dispersion of airborne pollutants. The Cerrado’s characteristic dry season, coupled with the plateau’s topography, can lead to stagnant air conditions, exacerbating the impact of local emissions and those transported from elsewhere. The relatively open terrain, while generally facilitating dispersion, can also allow for the rapid spread of dust and smoke from agricultural burning, a common practice during land clearing and crop residue management.

Cláudio’s tropical savanna climate dictates a distinct wet and dry season cycle, profoundly impacting air quality. The dry season, typically spanning from April to September, is characterized by lower rainfall, higher temperatures, and significantly reduced humidity. This period often witnesses a marked increase in particulate matter concentrations, largely due to agricultural burning practices employed for land preparation and crop residue disposal. The lack of rainfall and lower humidity contribute to the persistence of smoke plumes, and the relatively stable atmospheric conditions, frequently featuring temperature inversions, trap pollutants close to the ground. During these months, outdoor activities should be approached with caution, particularly for individuals with respiratory sensitivities. The wet season, from October to March, brings increased rainfall and higher humidity, naturally cleansing the atmosphere and reducing particulate concentrations. However, periods of intense rainfall can also lead to increased mold and fungal spore counts, impacting indoor air quality. Fog, though infrequent, can occur during the cooler months, further restricting pollutant dispersion. The combination of reduced wind speeds and increased humidity during the wet season can occasionally lead to localized pockets of elevated ozone concentrations, though this is less common than particulate pollution. Sensitive groups, including children, the elderly, and those with pre-existing respiratory conditions, should monitor local conditions and limit prolonged outdoor exposure during the dry season, especially when agricultural burning is prevalent.