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Alto do Rodrigues, nestled in the interior of Rio Grande do Norte, Brazil, occupies a unique geographic position within the Seridó region. Located at approximately -5.2878° latitude and -36.7619° longitude, the municipality sits at a relatively high elevation for the state, averaging around 500-600 meters above sea level. This elevation contributes to cooler temperatures compared to the coastal areas, a significant factor in local climate and air circulation patterns. The surrounding landscape is characterized by a transition zone between the Caatinga biome, a semi-arid scrubland, and areas of cerrado, a savanna-like ecosystem. This mix influences vegetation cover and potential sources of particulate matter, such as dust storms common in the Caatinga. The urban character of Alto do Rodrigues is primarily rural, with agriculture – particularly goat farming and subsistence crops – dominating the local economy. While not directly adjacent to major rivers, the municipality draws water from smaller tributaries and groundwater sources, impacting local humidity and potential for fog formation, which can trap pollutants. The urban–rural gradient is gradual, with small settlements and agricultural land extending outwards. There are no major industrial belts immediately surrounding Alto do Rodrigues; however, the proximity to larger regional centers like Caicó means occasional transport-related emissions can influence air quality. The terrain is undulating, with hills and valleys, which can create localized variations in wind flow and pollutant dispersion, potentially leading to areas of higher concentration.

Alto do Rodrigues experiences a distinct tropical climate with a pronounced wet and dry season, significantly impacting air quality throughout the year. The dry season, typically spanning from April to September, is characterized by intense solar radiation, low humidity, and frequent winds. These conditions often lead to increased dust emissions from agricultural lands and the surrounding Caatinga, contributing to elevated particulate matter in the air. Temperature inversions, common during the cooler nights of this period, can trap pollutants near the ground, exacerbating the issue. The wet season, from October to March, brings increased rainfall and higher humidity, which naturally helps to cleanse the atmosphere by washing away particulate matter. However, heavy rainfall can also lead to soil erosion and the suspension of fine particles. During the transition months (March/April and September/October), wind patterns are often more variable, leading to unpredictable air quality fluctuations. The months of August and September are generally considered periods when outdoor activities should be approached with caution, particularly for individuals with respiratory sensitivities. Children, the elderly, and those with pre-existing lung conditions are advised to limit prolonged exposure during these times. Maintaining indoor air quality through proper ventilation and air filtration can be beneficial. The increased humidity during the wet season can also promote the growth of mold and mildew, which can trigger allergic reactions and impact indoor air quality, requiring vigilance in maintaining clean and dry living spaces.