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Jucurutu, nestled in the state of Rio Grande do Norte, Brazil, occupies a unique geographic position within the semi-arid Sertão region. Located at -6.0339 latitude and -37.0200 longitude, the city sits approximately 300 meters above sea level, characterized by a gently undulating terrain typical of the Brazilian Northeast. The surrounding landscape is dominated by *caatinga* vegetation – a thorny scrubland adapted to prolonged drought. Jucurutu isn’t directly adjacent to a major body of water, though it’s situated within the broader São Francisco River basin, benefiting from irrigation projects linked to the river. The urban character is distinctly rural, with a relatively low population of 17,793, reflecting a strong agricultural base. The urban-rural gradient is sharp; the city centre gives way quickly to extensive farmland and pastureland. Air quality is significantly influenced by this agricultural activity, particularly during dry seasons when dust from tilling and livestock contributes to particulate matter. The lack of substantial industrial belts nearby means that the primary pollution sources are localized – biomass burning for land clearing, vehicle emissions within the city, and fugitive dust. The prevailing winds, generally from the east, can transport pollutants across the city, impacting air quality depending on source locations and meteorological conditions. The topography, while not mountainous, can create localized pockets where pollutants accumulate.

Jucurutu experiences a pronounced wet and dry season, dictating the rhythm of air quality. The wet season, typically from March to August, brings relief from dust and a temporary improvement in air quality. Rainfall suppresses particulate matter, and increased humidity reduces the likelihood of wildfires. However, even during this period, localized pollution from vehicle emissions and biomass burning for agricultural purposes can occur. The dry season, spanning September to February, presents the greatest challenges. Reduced rainfall leads to increased dust resuspension from agricultural lands and unpaved roads. This period also sees a rise in intentional burning for land preparation, releasing significant amounts of smoke and particulate matter. Temperature inversions, common during the cooler nights of the dry season, trap pollutants near the ground, exacerbating air quality issues. November and December are typically the worst months for air quality. Sensitive groups – children, the elderly, and individuals with respiratory conditions – should limit outdoor activity during these periods. Monitoring wind patterns is crucial; winds from agricultural areas will carry higher concentrations of dust and smoke. Staying indoors with windows closed and using air purifiers can offer protection. Hydration is also key to mitigating the effects of particulate matter inhalation.