Alagoinha Air Quality Index (AQI)

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Alagoinha, nestled in the Paraíba state of northeastern Brazil, occupies a geographically significant position within the Agreste region, a transitional zone between the humid coastal forests and the arid interior of the Northeast. Located at approximately -6.9500 latitude and -35.5450 longitude, the city’s terrain is characterized by rolling hills and valleys, typical of the broader Borborema Plateau. The elevation ranges from roughly 400 to 600 meters above sea level, influencing local weather patterns and air circulation. While not directly bordering a major river, Alagoinha benefits from proximity to smaller tributaries and seasonal streams that contribute to the region’s water resources. The surrounding landscape is a mosaic of small-scale agriculture, primarily focusing on crops like cassava, beans, and fruits, interspersed with patches of semi-arid vegetation and scrubland. This agricultural activity, while vital to the local economy, can contribute to localized air pollution through the use of fertilizers and occasional burning of agricultural residues. The urban–rural gradient around Alagoinha is relatively gradual, with small settlements and farms extending outwards, creating a diffuse pattern of human activity. The city itself exhibits a modest urban character, with a central plaza and radiating residential areas. Its location away from major industrial belts means that large-scale industrial emissions are not a primary concern; however, the cumulative impact of smaller-scale agricultural practices and vehicle traffic within the city and surrounding areas does influence local air quality. The prevailing winds, generally from the northeast, play a crucial role in dispersing pollutants, though topographic features can sometimes create localized pockets of stagnant air.

Alagoinha’s tropical climate dictates a distinct wet and dry season pattern, significantly impacting air quality throughout the year. The dry season, typically spanning from August to November, is characterized by reduced rainfall and increased temperatures. This period often sees a rise in particulate matter as the lack of rain allows dust and agricultural emissions to accumulate. The drier air also promotes the formation of temperature inversions, particularly during the early morning hours, trapping pollutants closer to the ground. These inversions can persist for several hours, exacerbating respiratory issues. Conversely, the wet season, from March to July, brings frequent rainfall and higher humidity, naturally cleansing the atmosphere and reducing particulate concentrations. The increased rainfall effectively ‘washes’ pollutants from the air, leading to improved air quality. However, heavy rainfall events can occasionally lead to increased levels of mold and fungal spores, impacting indoor air quality and potentially triggering allergic reactions. During the transition months (February and December), wind patterns become more variable, leading to unpredictable fluctuations in air quality. Individuals with respiratory conditions, such as asthma or bronchitis, should exercise caution during the dry season, particularly during periods of stagnant air. Children and the elderly are also more vulnerable and should limit prolonged outdoor exposure during these times. Maintaining indoor air quality through proper ventilation and air filtration can provide some relief. The increased humidity during the wet season can be beneficial for those with dry skin or respiratory ailments, but vigilance regarding mold growth is essential.