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Maribondo, a municipality nestled within the state of Alagoas in northeastern Brazil, presents a unique geographic context influencing its air quality. Located at approximately -9.5769 latitude and -36.3050 longitude, the city sits within the broader semi-arid region of the Brazilian Northeast, characterized by a gently undulating terrain. The landscape surrounding Maribondo is predominantly composed of *agreste* vegetation – a transitional zone between the coastal forests and the drier *sertão* interior. This means a mix of scrubland, caatinga forests, and agricultural patches. The elevation is relatively low, contributing to limited atmospheric dispersion. Maribondo is not directly on the coast, but is situated inland, approximately 40km from the Atlantic Ocean, meaning coastal breezes have a limited direct impact. The urban-rural gradient is fairly sharp; Maribondo itself is a relatively small urban center surrounded by agricultural land, primarily sugarcane and fruit cultivation. This agricultural activity, alongside potential small-scale industrial processing of these crops, represents a key source of particulate matter and volatile organic compounds. The lack of significant natural barriers to wind flow, combined with the region’s susceptibility to dust from drier areas, further complicates air quality management. The city’s position within a river basin also influences local humidity and potential for temperature inversions, trapping pollutants.

Maribondo experiences a distinct wet and dry season, heavily influencing its air quality. The wet season, typically running from April to August, brings relief from dust and a temporary improvement in air quality due to rainfall scavenging pollutants. However, increased humidity can also foster mold growth, impacting respiratory health. The driest months, September to March, are when air quality concerns peak. The prolonged lack of rainfall leads to increased dust resuspension from agricultural lands and unpaved roads, elevating particulate matter concentrations. Temperature inversions are common during the dry season, particularly in the early mornings, trapping pollutants near ground level. Strong easterly winds, prevalent during parts of the dry season, can transport dust and pollutants from further inland. February and March are generally the worst months for outdoor activity due to the combination of dryness, dust, and potential for inversion conditions. Sensitive groups – children, the elderly, and those with pre-existing respiratory conditions – should limit strenuous outdoor activity during these periods. Monitoring local weather patterns and avoiding peak pollution times (early mornings and late afternoons) is advisable. The transition periods (March/April and August/September) offer the most favourable conditions.