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Pocinhos, nestled in the state of Paraíba, Brazil, occupies a unique geographic position within the semi-arid Sertão region. Located at -7.0769 latitude and -36.0608 longitude, the city sits inland, approximately 200km from the Atlantic coast. The terrain is characterised by rolling hills and plateaus, typical of the Borborema Plateau, with an elevation ranging between 180-250 meters. This inland location significantly influences air quality, as coastal breezes offering natural dispersion are absent. Pocinhos is surrounded by *caatinga* vegetation, a thorny scrubland adapted to drought conditions, and is interspersed with small agricultural areas focused on subsistence farming and, increasingly, fruit cultivation. The urban-rural gradient is relatively sharp; Pocinhos itself is a compact municipality, but quickly transitions to sparsely populated rural landscapes. While not a major industrial hub, regional economic activity centres around agriculture and small-scale manufacturing, contributing to localised emissions. Dust from agricultural practices and unpaved roads is a persistent factor. The lack of significant water bodies nearby limits evaporative cooling and can exacerbate heat island effects, potentially trapping pollutants. The city’s position within a valley can also contribute to temperature inversions, hindering pollutant dispersal. Understanding this interplay of topography, land use, and climate is crucial for assessing and mitigating air quality challenges in Pocinhos.

Air quality in Pocinhos follows a distinct seasonal pattern dictated by the region’s bimodal rainfall regime. The wet season, typically from March to August, brings temporary relief from particulate matter pollution. Increased rainfall effectively suppresses dust from agricultural lands and unpaved roads, improving visibility and reducing respiratory irritants. However, higher humidity can also promote the formation of mold and fungal spores, potentially impacting sensitive individuals. The dry season, spanning September to February, presents the most significant air quality concerns. Prolonged drought conditions lead to increased dust suspension, exacerbated by wind erosion and agricultural activities. Temperature inversions are more frequent during the cooler, drier nights of this period, trapping pollutants near ground level. November and December are often the worst months for air quality due to harvest activities and increased burning of vegetation. Sensitive groups – children, the elderly, and those with pre-existing respiratory conditions – should limit strenuous outdoor activity during these months. Monitoring wind patterns is crucial; winds from the west often carry dust from further inland. Localized burning for land clearing, common in the dry season, also contributes to temporary spikes in particulate matter. Staying indoors with windows closed during peak pollution periods is advised.