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Inajá, a municipality nestled in the interior of Pernambuco, Brazil, presents a unique geographic context influencing its air quality. Located at -8.9030°S, -37.8270°W, the city sits within the semi-arid Agreste region, a transitional zone between the humid coastal forests (Mata Atlântica) and the drier Sertão. The terrain is characterized by rolling hills and plateaus, with elevations ranging between 200 and 500 meters. This topography, while offering some natural drainage, can also contribute to localized air stagnation. Inajá is not directly adjacent to major bodies of water, though smaller rivers and streams crisscross the landscape, providing limited evaporative cooling. The surrounding landscape is predominantly agricultural, with sugarcane and fruit cultivation being prominent. While not a heavily industrialized area, the processing of agricultural products contributes to particulate matter emissions. The urban-rural gradient is relatively sharp; the city centre is compact, quickly giving way to rural farmland. This proximity to agricultural activities, coupled with the region’s susceptibility to drought and dust storms, significantly impacts the baseline air quality. The prevailing winds, typically easterly, transport pollutants from coastal areas inland, while local wind patterns can exacerbate or disperse pollution depending on atmospheric conditions. Understanding this interplay is crucial for assessing and mitigating air quality concerns in Inajá.

Inajá experiences a distinct wet and dry season, heavily influencing air quality patterns. The wet season, generally spanning from March to August, brings relief from dust and particulate matter. Rainfall effectively suppresses airborne particles, leading to improved air quality. However, increased humidity can also foster mold growth, potentially impacting respiratory health. September to February marks the dry season, characterized by intense heat and prolonged drought. This period sees a significant increase in particulate matter, primarily from agricultural activities like sugarcane burning and land preparation, as well as dust lifted by strong winds. Temperature inversions, common during the cooler nights of the dry season, trap pollutants near the ground, worsening air quality. November and December are typically the months with the poorest air quality due to widespread agricultural burning. Sensitive groups – children, the elderly, and individuals with respiratory conditions – should limit outdoor exertion during these months. Conversely, the wetter months of May and June offer the most favourable conditions for outdoor activities. Monitoring wind direction is crucial; winds from the east can bring pollutants from more industrialized coastal regions. Localized dust events can occur at any time, but are more frequent during the dry season.