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Taperoá, nestled in the interior of Bahia, Brazil, occupies a geographically significant position within the Sertão region, a vast semi-arid expanse characterized by undulating plains and sparse vegetation. Located at approximately -13.5378° latitude and -39.0989° longitude, the city sits at a modest elevation of around 330 meters above sea level. The surrounding landscape is dominated by the Caatinga biome, a unique dry tropical forest adapted to prolonged drought conditions, featuring thorny shrubs, cacti, and deciduous trees that shed their leaves during the dry season. This vegetation, while resilient, contributes to localized dust events. Taperoá’s proximity to the Rio São Francisco, though not directly adjacent, is crucial; the river’s influence moderates temperatures slightly and provides a vital water source for agriculture, primarily focusing on cassava, beans, and corn cultivation. This agricultural activity, while essential for the local economy, can contribute to particulate matter pollution, particularly during planting and harvesting seasons. The urban–rural gradient transitions rapidly, with small farms and scattered settlements surrounding the town. There are no major industrial belts immediately adjacent to Taperoá; however, regional transport routes pass nearby, potentially introducing pollutants from passing vehicles. The relatively flat terrain and limited topographical features mean that air pollutants tend to disperse slowly, especially during periods of atmospheric stability, impacting local air quality. The climate is hot and semi-arid, further influencing the behaviour of airborne particles.

Taperoá’s tropical climate dictates a distinct wet and dry season cycle, profoundly impacting air quality. The dry season, typically spanning from April to September, is characterized by intense heat, low humidity, and infrequent rainfall. This period often witnesses elevated levels of particulate matter due to increased dust lifted by strong winds, a common occurrence in the Sertão. The lack of rainfall means there's minimal atmospheric cleansing. Temperature inversions, where a layer of warm air traps cooler air near the ground, can also occur, further exacerbating pollution by preventing vertical dispersion. Conversely, the wet season (October to March) brings relief, with frequent rainfall washing away accumulated pollutants and increasing humidity, which helps to settle dust. However, heavy rainfall can also lead to temporary increases in mold spores and associated allergens. The months of August and September are generally the most challenging for air quality, with persistent dry conditions and high temperatures. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should limit outdoor exertion during these periods. During the wet season, while overall air quality improves, those with pollen allergies should remain vigilant. The prevailing winds, often from the northeast, can carry dust and pollutants from surrounding agricultural areas into the town. Fog, though infrequent, can also trap pollutants, creating localized pockets of poor air quality, particularly in the early morning hours. Maintaining indoor air quality through ventilation and air purification can be beneficial throughout the year.