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Andaraí, nestled in the southern reaches of Bahia, Brazil, occupies a geographically significant position within the Serra do Espinhaço mountain range. Its coordinates, -12.8069, -41.3308, place it at an elevation averaging around 800 meters above sea level, contributing to a cooler climate than much of coastal Bahia. The surrounding landscape is dominated by rugged, forested hills and valleys, characteristic of the Cerrado biome transitioning into Atlantic Forest. This terrain significantly influences local air circulation patterns; valleys can trap pollutants, while the slopes promote dispersion under favourable wind conditions. Andaraí’s proximity to the Rio de Contas, a vital waterway, provides a degree of humidity, which can impact the behaviour of particulate matter. The urban character is distinctly rural, with a small population of 13,080, primarily engaged in agriculture, particularly coffee and livestock farming. This agricultural activity, while vital to the local economy, can contribute to localised air pollution through the use of fertilizers, pesticides, and burning practices during land clearing, though on a smaller scale than larger industrial centres. The urban–rural gradient is gradual, with small settlements and farms extending outwards into the surrounding hills. There are no major industrial belts immediately adjacent to Andaraí; however, the region's mineral resources (historically manganese) could pose a future risk if mining activities intensify. The mountainous terrain and prevailing winds dictate that air quality is generally better than in flatter, more densely populated areas, but localised events can still impact residents.

Andaraí’s tropical climate exhibits a distinct wet and dry season pattern, profoundly influencing its air quality. The dry season, typically from May to September, is characterised by lower rainfall and increased sunshine hours. This period often sees a slight increase in particulate matter concentrations, primarily due to agricultural burning practices used for land preparation and pasture management. While winds are generally consistent, temperature inversions can occasionally occur during the cooler nights of June and July, trapping pollutants in the valleys and leading to temporary reductions in air quality. The wet season, from October to April, brings frequent rainfall and higher humidity, effectively ‘washing’ the atmosphere and significantly reducing particulate matter. The increased cloud cover also reduces solar radiation, which can impact the formation of ozone, a secondary pollutant. Fog, though infrequent, can occur during the wet season, particularly in the valleys, further hindering pollutant dispersion. During the transition months (April/May and September/October), wind patterns can be variable, leading to unpredictable air quality fluctuations. Sensitive groups, such as children, the elderly, and individuals with respiratory conditions, should be mindful of potential increases in particulate matter during the dry season and avoid strenuous outdoor activity on days with visible smoke. The high humidity during the wet season can exacerbate respiratory issues for some, so maintaining indoor air quality is important. Overall, the wet season offers the most favourable conditions for outdoor activities, while the dry season requires increased vigilance regarding air quality and potential health impacts.