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Anadia, a municipality nestled in the state of Alagoas, Brazil, occupies a relatively flat coastal plain location at approximately -9.6844 latitude and -36.3042 longitude. Its geography is defined by the transition zone between the *agreste* (roughlands) and the coastal *zona da mata* (forest zone), influencing both its climate and potential air quality challenges. The city’s elevation is low, averaging around 30 meters above sea level, contributing to limited atmospheric dispersion of pollutants. Anadia is situated inland from the Atlantic Ocean, approximately 25 kilometers from the coast, meaning direct marine influences on air quality are moderated but still present, particularly in terms of humidity and salt spray. The surrounding landscape is predominantly agricultural, with sugarcane and cassava cultivation being prominent. This agricultural activity, alongside smaller-scale livestock farming, introduces potential sources of particulate matter from land preparation, burning of agricultural residues, and animal waste. The urban-rural gradient is relatively sharp, with the city centre representing a concentrated source of emissions from traffic and domestic fuel use, while surrounding areas are dominated by agricultural practices. The lack of significant industrial belts within Anadia itself means that the primary air quality concerns are linked to localized sources and regional transport of pollutants from larger urban centres along the Alagoas coastline.

Anadia experiences a tropical climate, characterized by a distinct wet and dry season rather than traditional four seasons. Air quality in Anadia is most compromised during the dry season, typically from September to February. Reduced rainfall leads to increased dust resuspension from agricultural lands and unpaved roads, elevating particulate matter concentrations. Lower humidity also inhibits the natural scavenging of pollutants by atmospheric moisture. Temperature inversions, common during the cooler nights of the dry season, trap pollutants near the ground, exacerbating air quality issues. The wet season, from March to August, generally brings improved air quality due to rainfall washing away pollutants and increased atmospheric mixing. However, even during the wet season, localized pollution from traffic and biomass burning can occur. Months like November and December, marking the transition into the drier period, often see a spike in agricultural burning, impacting air quality. Sensitive groups – children, the elderly, and individuals with respiratory conditions – should limit strenuous outdoor activity during the dry season, particularly in the late afternoon and early morning. Monitoring wind patterns is crucial; winds from the west can carry pollutants from inland agricultural areas, while easterly winds may bring some relief from marine air.