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Jardim de Piranhas, nestled in the semi-arid interior of Rio Grande do Norte, Brazil, occupies a unique geographic position along the banks of the Piranhas River, a crucial tributary of the São Francisco River. The city’s coordinates (-6.3789, -37.3519) place it within a landscape characterized by the *caatinga* biome – a thorny scrubland adapted to prolonged droughts. The terrain is gently undulating, transitioning from riverine lowlands to slightly elevated plateaus. This topography influences local air circulation patterns, potentially creating pockets of stagnant air. Jardim de Piranhas isn’t situated near major industrial belts; its economy is primarily driven by agriculture, particularly goat and sheep rearing, and fishing. However, the surrounding agricultural practices, including occasional controlled burns for pasture renewal, contribute to particulate matter emissions. The urban-rural gradient is relatively sharp, with the city centre concentrated along the river and quickly giving way to extensive rural areas. The proximity to the São Francisco River, while vital for water resources, also introduces humidity which can affect the dispersion of pollutants. Dust from the dry landscape is a persistent factor, exacerbated by wind erosion, impacting baseline air quality. The city’s relatively small size limits concentrated emissions, but regional transport of pollutants from larger centres further afield is a possibility.

Air quality in Jardim de Piranhas follows a distinct wet-dry seasonal pattern dictated by the region’s semi-arid climate. 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 common during this period exacerbate the issue, carrying dust across the city. Temperature inversions, where cooler air traps pollutants near the ground, are also more frequent during the cooler nights of the dry season. January to July marks the wet season, bringing significant improvements in air quality. Rainfall effectively washes away particulate matter, and increased humidity suppresses dust. However, even during the wet season, localized pollution from vehicle exhaust and small-scale burning can occur. Sensitive individuals – children, the elderly, and those with respiratory conditions – should be particularly cautious during the dry months, limiting strenuous outdoor activity. November and December are typically the months with the poorest air quality. Monitoring wind direction is crucial; winds from the west often carry dust from drier, more exposed areas. The wet season offers the most favourable conditions for outdoor activities.