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Afonso Bezerra, nestled in the state of Rio Grande do Norte, Brazil, occupies a geographically significant position within the Agreste region, a transitional zone between the humid coastal forests and the semi-arid interior of the Northeast. Located at approximately -5.4978° latitude and -36.5058° longitude, the city’s terrain is characterized by undulating hills and valleys, typical of the region's weathered sandstone plateaus. The elevation ranges modestly, contributing to localized microclimates. While not directly bordering a major river, Afonso Bezerra benefits from proximity to the Rio Piranhas basin, influencing regional rainfall patterns and groundwater availability. The surrounding landscape is a mosaic of small-scale agriculture, primarily focusing on subsistence farming and the cultivation of fruits like mango and cashew, alongside extensive areas of caatinga vegetation – a drought-resistant thorn forest. This agricultural activity, while vital to the local economy, can contribute to particulate matter emissions, particularly during harvesting and land clearing. The urban–rural gradient is relatively sharp; the city itself is compact, with a clear delineation between the built environment and the surrounding agricultural and natural landscapes. The absence of large-scale industrial zones within the immediate vicinity mitigates some pollution risks, however, transportation-related emissions from vehicles traversing the regional road network, connecting Afonso Bezerra to larger urban centers like Mossoró, represent a notable factor influencing local air quality. The prevailing winds, often influenced by the coastal breezes, play a crucial role in dispersing pollutants, though localized inversions can trap emissions under certain atmospheric conditions.

Afonso Bezerra’s tropical climate dictates a distinct wet and dry season pattern, profoundly impacting air quality dynamics. The dry season, typically spanning from August to November, is characterized by reduced rainfall, increased temperatures, and a higher frequency of atmospheric stability. This often leads to temperature inversions, where a layer of warm air traps cooler air near the ground, hindering the vertical dispersion of pollutants. Agricultural burning, a common practice for land preparation during this period, significantly elevates particulate matter concentrations, creating hazy conditions and impacting visibility. The dry winds can also carry dust from nearby agricultural fields, further degrading air quality. Conversely, the wet season (December to July) brings increased rainfall and higher humidity, naturally cleansing the atmosphere and reducing particulate pollution. Frequent rainfall events effectively ‘wash’ pollutants from the air. However, periods of prolonged fog, particularly during the transition months (March-April), can trap moisture and pollutants near the surface, creating localized episodes of reduced air quality. During the wet season, outdoor activities are generally more favorable, especially during the months of February and March when rainfall is less frequent. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the dry season, particularly on days with agricultural burning or when visibility is significantly reduced. Maintaining indoor air quality through proper ventilation and air filtration can also provide some protection. The intensity of the sun during the dry season can exacerbate respiratory issues, so adequate hydration and sun protection are also important considerations.