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Ibotirama, nestled in the heart of Bahia, Brazil, occupies a geographically significant position within the semi-arid Northeast region. Located at approximately -12.1850° latitude and -43.2208° longitude, the city’s terrain is characterized by undulating plains and gently sloping hills, typical of the *Chapada Diamantina* geological formation. The surrounding landscape is predominantly *caatinga* biome, a unique tropical dry forest adapted to harsh, seasonal rainfall. This vegetation, while resilient, can contribute to particulate matter during the dry season when leaf litter accumulates. Ibotirama sits relatively far from major bodies of water; the nearest significant river, the Rio de São Francisco, is a considerable distance away, limiting the moderating influence of large water surfaces on local climate and air quality. The urban footprint of Ibotirama is relatively compact, reflecting its population of around 26,309. The city’s economy is largely agrarian, with surrounding areas dedicated to subsistence farming and livestock rearing, potentially introducing agricultural dust and emissions from small-scale machinery. The urban–rural gradient is gradual, with agricultural land extending close to the city limits. The elevation, averaging around 500-600 meters above sea level, can influence atmospheric stability and the potential for temperature inversions, particularly during cooler months, which can trap pollutants near the ground. The regional position, far from major industrial belts, generally reduces the impact of large-scale industrial pollution, though localized agricultural practices and vehicle emissions remain key factors.

Ibotirama’s tropical climate dictates a distinct wet and dry season pattern, profoundly impacting air quality. The dry season, typically spanning from April to September, is characterized by intense solar radiation, high temperatures, and minimal rainfall. This period often sees a rise in particulate matter concentrations due to increased dust from agricultural fields and unpaved roads, exacerbated by wind erosion. The lack of rainfall prevents the natural cleansing effect of precipitation. Temperature inversions are more frequent during the cooler months (June-August), trapping pollutants closer to the ground, particularly in the mornings. The wet season, from October to March, brings relief with frequent rainfall, effectively washing away accumulated pollutants and improving air quality. However, heavy rainfall can also lead to increased humidity, which can exacerbate respiratory issues for sensitive individuals. Fog, though infrequent, can occur during the transition periods between seasons, further reducing visibility and trapping pollutants. During the wet season, agricultural activities may increase, potentially releasing ammonia and other emissions. Sensitive groups, including children, the elderly, and individuals with pre-existing respiratory conditions, should exercise caution during the dry season, limiting outdoor activities during peak sunlight hours and avoiding areas with high dust levels. The transition months (March/April and September/October) can be unpredictable, with fluctuating air quality; monitoring local conditions is advisable. Maintaining well-ventilated indoor spaces and using air purifiers can help mitigate indoor air pollution during periods of poor outdoor air quality.