Ingá Air Quality Index (AQI)

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Ingá, nestled in the state of Paraíba, Brazil, occupies a unique geographic position within the semi-arid Sertão region. Located at -7.2808 latitude and -35.6044 longitude, the city sits approximately 216 meters above sea level, characterized by a gently undulating terrain typical of the Brazilian Northeast. This landscape, part of the Borborema Plateau, features *caatinga* vegetation – a thorny scrubland adapted to prolonged dry periods. The urban character of Ingá is that of a smaller, inland city, serving as a regional hub for agricultural activity. Its proximity to the Paraíba River, while providing a vital water source, doesn’t offer significant dispersion of pollutants due to the river’s relatively narrow width and limited flow during drier months. Surrounding Ingá are extensive agricultural zones, primarily focused on subsistence farming and livestock raising. These activities contribute to particulate matter through land clearing and animal husbandry. The urban-rural gradient is relatively sharp, with agricultural land immediately bordering the city limits. The lack of substantial industrial belts within Ingá itself means that the primary air quality concerns stem from localized sources like vehicle emissions, biomass burning for agricultural purposes, and dust from unpaved roads, all exacerbated by the region’s climate.

Ingá experiences a distinct wet and dry season, heavily influencing its air quality. The dry season, typically from August to December, is when air quality deteriorates most significantly. Reduced rainfall leads to increased dust resuspension from agricultural lands and unpaved roads, elevating particulate matter concentrations. Biomass burning for land preparation also peaks during this period, releasing significant amounts of smoke and harmful gases. Temperature inversions, common during the cooler nights of the dry season, trap pollutants near the ground, worsening air quality. January to July marks the wet season, bringing relief from dust and smoke. Rainfall effectively washes particulate matter from the atmosphere, and increased humidity suppresses dust resuspension. However, even during the wet season, vehicle emissions remain a consistent source of pollution. Sensitive groups – children, the elderly, and individuals with respiratory conditions – should be particularly cautious during the dry season, limiting outdoor activity on days with visible haze or smoke. The months of March and April, transitioning from wet to dry, often offer the most favourable conditions for outdoor activities. Monitoring wind patterns is crucial; winds from the west can carry smoke from distant agricultural fires into the city.