Ribeira do Pombal Air Quality Index (AQI)

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Ribeira do Pombal, nestled in the interior of Bahia state, Brazil, occupies a geographically complex position within the semi-arid Sertão region. Located at approximately -10.8339 latitude and -38.5358 longitude, the city sits on a gently undulating plateau, part of the broader Borborema Plateau. The terrain is characterised by *caatinga* vegetation – thorny scrubland adapted to harsh conditions – and scattered hills. This inland location, roughly 300km from the Atlantic coast, means maritime influences are minimal, contributing to a continental climate. The surrounding landscape is predominantly agricultural, with significant areas dedicated to subsistence farming and, increasingly, large-scale soybean and corn cultivation. While not heavily industrialised, the growth of agribusiness brings associated vehicle emissions and dust from land preparation. The urban-rural gradient is relatively sharp; Ribeira do Pombal is a regional hub, but quickly gives way to sparsely populated rural areas. Air quality is particularly vulnerable to dust resuspension from agricultural practices and seasonal wildfires, exacerbated by the lack of significant natural windbreaks. The São Francisco River, a vital water source, lies to the south, but its distance limits its direct impact on local air circulation patterns. The city’s elevation, around 200-300m, doesn’t create strong temperature inversions, but local topography can trap pollutants during calm conditions.

Ribeira do Pombal experiences a distinct wet and dry season, heavily influencing air quality. The dry season, typically from August to December, is the period of greatest concern. Reduced rainfall leads to increased dust resuspension from agricultural lands and unpaved roads, significantly impacting particulate matter levels. Wildfires, often used for land clearing, are also prevalent during these months, releasing substantial smoke and harmful gases. November and December are particularly challenging. The wet season, from January to July, brings a temporary improvement in air quality as rainfall suppresses dust and washes pollutants from the atmosphere. However, even during the wet season, localised pollution can occur from vehicle emissions and agricultural activities. February and March, the peak of the rainy season, generally offer the best air quality. Temperature inversions, while not frequent, can occur during calm nights in the dry season, trapping pollutants near ground level. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit outdoor activity during the dry season, particularly on days with visible haze or smoke. Monitoring wind patterns is crucial; winds from agricultural areas can carry dust and pollutants into the city.