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Guelma, nestled in northeastern Algeria, occupies a strategically important position within the Tell Atlas Mountains, a range defining Algeria’s coastal geography. Situated at approximately 36.45°N, 7.43°E, the city’s elevation averages around 350 meters above sea level, influencing local weather patterns and air circulation. Guelma’s urban fabric is characterized by a blend of modern development and traditional architecture, sprawling across a relatively flat plain carved by the Seybouse River, a vital water source for the region. The surrounding landscape is a mosaic of agricultural land – primarily olive groves and cereal fields – interspersed with pockets of maquis shrubland typical of the Mediterranean climate. To the west, the mountains rise sharply, creating a barrier that can trap pollutants under certain meteorological conditions. The city’s proximity to the Mediterranean Sea, roughly 30 kilometers to the north, introduces a maritime influence, moderating temperatures but also potentially contributing to coastal fog events. While not directly adjacent to major industrial belts, Guelma serves as a regional hub for agricultural processing and light manufacturing, contributing to localized emissions. The urban-rural gradient transitions relatively quickly, with agricultural activities dominating the immediate periphery, impacting air quality through dust and agricultural byproduct emissions. The Tell Atlas’s topography plays a crucial role in channeling winds and influencing the dispersion of pollutants, making localized air quality highly sensitive to prevailing weather systems.

Guelma’s air quality experiences a distinct seasonal cycle dictated by its Mediterranean climate. Summers (June-August) are typically hot and dry, characterized by stagnant air and frequent temperature inversions, particularly during July and August. These inversions trap pollutants close to the ground, leading to periods of reduced visibility and potentially elevated concentrations of particulate matter and ozone. The lack of significant rainfall during this period exacerbates the issue, as there’s minimal natural cleansing of the atmosphere. Autumn (September-November) brings a gradual shift, with increased rainfall and more frequent wind events that help disperse pollutants, offering a respite from summer’s stagnation. Winter (December-February) is generally the most favourable season for air quality, with cooler temperatures and more consistent wind patterns. However, occasional cold air masses can lead to fog formation, which, while visually striking, can also trap pollutants. Spring (March-May) sees a gradual warming trend, with increasing sunshine hours but also a rise in pollen levels, which can impact respiratory health. Individuals with asthma or other respiratory conditions should exercise caution during the summer months, limiting outdoor activity during peak heat and avoiding areas with high traffic density. During periods of fog, particularly in winter, vulnerable populations, including children and the elderly, should minimize exposure to the outdoors. The agricultural cycle also influences air quality, with increased dust emissions during planting and harvesting seasons, particularly in the spring and autumn.