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Sítio do Mato, nestled in the state of Bahia, Brazil, at coordinates -13.0850, -43.4650, presents a unique geographic context influencing its air quality. The city’s terrain is characterized by undulating hills typical of the Brazilian interior, transitioning into the broader Chapada Diamantina region to the west. Situated approximately 250km inland from the Atlantic coast, Sítio do Mato isn’t directly impacted by marine breezes, but experiences a continental tropical climate. The surrounding landscape is predominantly *caatinga*, a semi-arid scrubland, interspersed with areas of transitioning cerrado vegetation. The elevation, around 400-500m, contributes to temperature variations. While not a major industrial hub, the region supports significant agricultural activity, primarily cattle ranching and subsistence farming, with potential for seasonal burning of vegetation. The urban-rural gradient is relatively sharp; Sítio do Mato serves as a regional service center for smaller, more dispersed rural communities. This proximity to agricultural lands and the practice of open burning, coupled with dust from unpaved roads common in the region, are key factors affecting local air quality. The limited dispersion of pollutants due to the hilly terrain and infrequent strong winds can exacerbate these issues, particularly during drier periods. The city’s relatively small size means pollution sources are concentrated, impacting localized air quality.

Sítio do Mato experiences a pronounced wet and dry season, dictating the annual air quality narrative. The dry season, typically from May to September, is when air quality concerns peak. Reduced rainfall leads to increased dust resuspension from agricultural lands and unpaved roads, contributing to particulate matter pollution. This period also coincides with increased agricultural burning for land clearing and pasture management, releasing significant amounts of smoke and harmful gases. Temperature inversions, common during the cooler nights of the dry season, trap pollutants near the ground, worsening air quality. October to April marks the wet season, bringing relief from dust and smoke. Rainfall effectively washes particulate matter from the atmosphere, and increased humidity suppresses dust resuspension. However, even during the wet season, localized pollution from vehicle emissions and small-scale burning can occur. Sensitive individuals, such as those with respiratory conditions or the elderly, should be particularly cautious during the dry season, limiting strenuous outdoor activity and monitoring their health. The months of August and September are generally the most challenging for air quality, while February and March offer the most favourable conditions. Fog can occasionally form during the transition periods, potentially trapping pollutants.