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Pau dos Ferros, nestled in the state of Rio Grande do Norte, Brazil, occupies a unique geographic position within the semi-arid Sertão region. Located at -6.1108 latitude and -38.2089 longitude, the city sits approximately 180km inland from the Atlantic coast, at an elevation of around 220 meters. The surrounding landscape is characterised by *caatinga* scrubland, a resilient but fragile ecosystem adapted to prolonged droughts. The terrain is generally flat to gently undulating, with scattered hills and *serra* formations in the distance. Pau dos Ferros’ air quality is significantly influenced by its inland location, shielding it somewhat from direct marine influences but exposing it to dust and particulate matter originating from the dry interior. The city’s urban-rural gradient is relatively sharp, with agricultural activities – primarily livestock raising and subsistence farming – dominating the surrounding areas. While not a major industrial hub, regional economic activity centres around agriculture and small-scale commerce. The lack of significant natural barriers to wind flow means pollutants can disperse relatively quickly, but during drier periods, dust resuspension becomes a major concern. The city’s position within a broad river valley also influences local microclimates and potential for temperature inversions, trapping pollutants near ground level. Understanding these factors is crucial for assessing and mitigating air quality challenges.

Pau dos Ferros experiences a distinct wet and dry season, heavily influencing its air quality. The dry season, typically from August to December, presents the most challenging conditions. Reduced rainfall leads to increased dust resuspension from the *caatinga* vegetation and agricultural lands, elevating particulate matter concentrations. Strong, dry winds exacerbate this issue, carrying dust across the city. Temperature inversions, common during the cooler nights of the dry season, trap pollutants near the ground, worsening air quality. January to July marks the wet season, bringing significant improvements. Rainfall effectively washes away particulate matter, and increased humidity suppresses dust. However, even during the wet season, localised pollution from vehicle emissions and small-scale burning of agricultural waste can occur. March and April, transitioning from wet to dry, often see a temporary increase in pollutants as the landscape dries out. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit outdoor activity during the peak of the dry season (September-November). Monitoring wind patterns and avoiding strenuous activity on windy, dry days is advisable. The wet season (February-June) generally offers the most favourable conditions for outdoor pursuits.