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Sanharó, a municipality nestled in the interior of Pernambuco state, Brazil, presents a unique geographic context influencing its air quality. Located at -8.3608, -36.5658, 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 characterised by rolling hills and plateaus, with elevations ranging between 200 and 500 meters. This topography, while offering some natural drainage, can also contribute to localised air stagnation. Sanharó isn’t directly adjacent to the coast, but is influenced by prevailing easterly trade winds carrying moisture from the Atlantic. The surrounding landscape is predominantly agricultural, with sugarcane and fruit cultivation being prominent. While not a major industrial hub, smaller-scale processing of agricultural products occurs within and around the city. The urban-rural gradient is relatively sharp, with a concentrated urban core surrounded by extensive farmland. Dust from agricultural activities, particularly during drier periods, is a significant factor. The lack of extensive forest cover contributes to reduced natural air filtration. Road dust from the limited paved road network also adds to particulate matter concentrations, impacting local air quality, especially during the dry season. The city’s relatively small size limits dispersion potential.

Sanharó experiences a distinct wet and dry season, heavily influencing air quality. The wet season, typically from March to August, brings relief from dust and particulate matter. Rainfall effectively washes pollutants from the atmosphere and suppresses dust resuspension from agricultural lands. However, increased humidity can also foster mold growth, potentially exacerbating respiratory issues for sensitive individuals. September to February marks the dry season, a period of heightened air pollution. Reduced rainfall allows dust and particulate matter from agricultural activities – sugarcane harvesting and land preparation – to accumulate. Temperature inversions, common during the cooler nights of the dry season, trap pollutants near ground level, worsening air quality. Wind patterns, generally easterly, can transport pollutants from nearby areas. February and March often see the highest concentrations of airborne particles. For individuals with asthma or other respiratory conditions, avoiding strenuous outdoor activity during these months is advisable. The transition months (March and September) can be unpredictable, with fluctuating air quality. Monitoring local conditions is crucial. The dry heat can also increase ozone formation, though this is less pronounced than in larger industrial cities.