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Aurelino Leal, a municipality nestled within the state of Bahia, Brazil, occupies a geographically complex position. Located at approximately -14.3169 latitude and -39.3269 longitude, the city is situated in a region characterized by undulating coastal plains transitioning into the interior highlands. The terrain is gently rolling, interspersed with small streams and pockets of Atlantic Forest remnants. Aurelino Leal’s proximity to the coastline, roughly 30km inland, introduces a moderating influence on its climate, but also exposes it to potential salt spray and humidity-driven atmospheric conditions. The surrounding landscape is predominantly agricultural, with significant areas dedicated to cacao, coconut, and fruit cultivation. While not a major industrial hub itself, Aurelino Leal is within reach of larger industrial zones along the Bahia coastline, particularly around Salvador and Camaçari, which can contribute to regional pollutant transport. The urban-rural gradient is relatively sharp; the municipality’s population of approximately 11,179 is concentrated in the central area, surrounded by extensive agricultural land. This mix of agricultural practices, potential long-range transport from industrial areas, and the local topography all play a role in shaping the city’s air quality profile. The lack of significant elevation limits atmospheric dispersion, potentially trapping pollutants during calm weather conditions.

Aurelino Leal experiences a tropical climate, defined by distinct wet and dry seasons rather than traditional four seasons. Air quality generally improves during the wet season (October to February) as rainfall effectively washes particulate matter from the atmosphere. However, high humidity can also foster mold growth, impacting indoor air quality. The dry season (March to September) presents the greatest air quality challenges. Reduced rainfall allows dust and agricultural burn-off smoke to accumulate, particularly in June and July when agricultural activities are often at their peak. Temperature inversions, common during the cooler, drier nights, can trap pollutants near ground level, exacerbating conditions. Winds are generally light and variable, offering limited dispersion. August and September often see increased dust levels due to land preparation for planting. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit strenuous outdoor activity during these drier months. Monitoring local agricultural practices is crucial, as burning for land clearing significantly degrades air quality. The transition months (September/October and February/March) can be unpredictable, with fluctuating humidity and potential for localized smoke events. Staying informed about local weather patterns and agricultural schedules is key to protecting respiratory health.