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Cabaceiras do Paraguaçu, nestled in the Recôncavo Baiano region of Bahia, Brazil, occupies a geographically significant position within a landscape shaped by the Paraguaçu River basin. Located at approximately -12.5358° latitude and -39.1908° longitude, the city’s terrain is characterized by gently undulating hills and valleys, typical of the transition zone between the Atlantic Forest biome and the semi-arid Caatinga. The Paraguaçu River, a vital waterway, flows nearby, influencing local climate and providing a source of water for agriculture and human consumption. The surrounding landscape is a mosaic of small-scale agriculture, primarily sugarcane and cassava cultivation, interspersed with patches of remnant Atlantic Forest. This agricultural activity, while crucial to the local economy, contributes to diffuse pollution sources. Cabaceiras do Paraguaçu exhibits a clear urban–rural gradient; the city center is relatively compact, while residential areas extend outwards, blending into the agricultural landscape. The elevation is relatively low, averaging around 150 meters above sea level, which can exacerbate air stagnation under certain meteorological conditions. The Recôncavo Baiano’s coastal proximity introduces a maritime influence, moderating temperatures but also potentially carrying coastal pollutants inland. The region’s position away from major industrial belts means that large-scale industrial emissions are less of a direct concern, though regional transportation corridors can still contribute to localized air pollution.

Cabaceiras do Paraguaçu experiences a tropical climate with distinct wet and dry seasons, significantly impacting air quality patterns. The dry season, typically from September to March, is characterized by reduced rainfall and increased temperatures. This period often sees a build-up of pollutants due to decreased atmospheric washout – the process where rain removes particles from the air. Stagnant air conditions, particularly during periods of high pressure, are more frequent, leading to a concentration of particulate matter and gaseous pollutants from agricultural burning and vehicle emissions. Agricultural practices, including controlled burns for land clearing and sugarcane harvesting, are a major contributor to elevated particulate matter during these months. Conversely, the wet season (April to August) brings frequent rainfall, which effectively ‘cleanses’ the atmosphere, reducing pollutant concentrations. Increased cloud cover also reduces solar radiation, impacting photochemical reactions that form ozone. Fog, though infrequent, can trap pollutants near the ground, creating localized air quality concerns. During the transition months (March/April and August/September), fluctuating weather patterns can lead to unpredictable air quality episodes. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the dry season, limiting outdoor activities during peak burning periods and periods of stagnant air. Maintaining indoor air quality through ventilation and air filtration can also be beneficial.