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Nossa Senhora dos Milagres, nestled in the state of Bahia, Brazil, occupies a coastal position at approximately -12.8700 latitude and -39.8589 longitude. The municipality’s geography is defined by its proximity to the Atlantic Ocean, specifically the coastal zone of the Agreste Baiano region. The terrain is generally flat, transitioning from sandy beaches and low-lying coastal plains inland to slightly undulating areas. This flatness contributes to limited natural dispersion of pollutants. The city’s population of around 11,071 suggests a relatively low-density urban environment, though increasing tourism is altering this dynamic. Surrounding Nossa Senhora dos Milagres are areas of coconut groves and small-scale agriculture, primarily focused on fruit cultivation. While not a major industrial hub, regional agricultural practices, including occasional controlled burns for land clearing, can contribute to particulate matter. The urban-rural gradient is relatively sharp, with agricultural land bordering the town directly. The coastal location means prevailing winds are generally easterly, carrying marine influences but also potentially concentrating pollutants during periods of calm. The lack of significant elevation hinders atmospheric mixing, potentially exacerbating air quality issues during temperature inversions. The city’s air quality is therefore heavily influenced by both local activities and regional meteorological patterns.

Nossa Senhora dos Milagres experiences a tropical climate, broadly defined by a wet and dry season rather than traditional four seasons. Air quality generally improves during the wet season (roughly October to February) due to increased rainfall which effectively washes particulate matter from the atmosphere. Higher humidity, however, can also promote the formation of secondary pollutants. The dry season (March to September) presents the greatest air quality challenges. Lower rainfall means pollutants accumulate, and stronger, drier winds can carry dust and agricultural smoke from inland areas. August and September are typically the driest months, and therefore often see the poorest air quality. Temperature inversions, common during the cooler, drier nights, trap pollutants near the ground. Sensitive individuals, such as those with respiratory conditions or the elderly, should limit strenuous outdoor activity during these periods. The consistent easterly trade winds can sometimes offer relief, but calm periods can lead to stagnation. Fog, common in the early mornings, can exacerbate respiratory issues by trapping pollutants. Monitoring wind direction and avoiding outdoor exertion during calm, dry spells is advisable. The transition months (October/November and February/March) offer a balance, with improving/deteriorating conditions respectively.