Aroeiras Air Quality Index (AQI)

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Aroeiras, nestled in the state of Paraíba, Brazil, occupies a unique geographic position within the semi-arid Sertão region. Located at coordinates -7.5450, -35.7078, the city sits approximately 150 meters above sea level, characterized by a gently undulating terrain typical of the Borborema Plateau. This plateau landscape, formed by ancient crystalline rocks, influences drainage patterns and contributes to the region’s susceptibility to drought. Aroeiras isn’t directly coastal, lying roughly 80 kilometers inland from the Atlantic Ocean, but its climate is moderated by maritime influences. The surrounding landscape is dominated by *caatinga* vegetation – a thorny scrub forest adapted to arid conditions. While Aroeiras itself isn’t heavily industrialized, the broader Paraíba state experiences agricultural activity, particularly sugarcane and fruit cultivation, which can contribute to particulate matter from field burning and agricultural dust. The urban-rural gradient is relatively sharp; the city centre is compact, quickly transitioning to rural landscapes used for small-scale farming and livestock grazing. This proximity to agricultural lands, combined with the region’s dry climate and occasional dust storms, significantly impacts local air quality. The prevailing winds, generally from the southeast, can transport pollutants from agricultural areas towards the city, while the lack of significant rainfall often limits natural cleansing processes.

Aroeiras experiences a distinct wet and dry season, rather than traditional four seasons. Air quality is generally poorest during the prolonged dry season, spanning from August to December. This period sees minimal rainfall, allowing dust and particulate matter from agricultural activities and unpaved roads to accumulate. Strong, dry winds exacerbate the issue, carrying these pollutants across the city. Temperature inversions, common during cooler nights within the dry season, trap pollutants near ground level, worsening air quality. January to April brings the wet season, offering significant relief. Rainfall effectively washes away accumulated pollutants, and increased humidity suppresses dust. However, even during the wet season, localized pollution can occur from vehicle emissions and small-scale burning. May to July represents a transitional period with fluctuating conditions. Sensitive individuals – children, the elderly, and those with respiratory conditions – should be particularly cautious during the peak of the dry season (September-November). Outdoor activity is best scheduled for the wetter months, especially after substantial rainfall. Monitoring local conditions and limiting strenuous activity on dry, windy days is crucial for maintaining respiratory health.