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Chaabat el Leham, nestled within the Aïn Temouchent province of Algeria, occupies a geographically significant position along the Mediterranean coast. Located at approximately 35.3361° latitude and -1.1011° longitude, the town’s terrain is characterized by a gentle slope rising from the coastal plain towards the Tell Atlas Mountains, which loom in the distance. This proximity to the mountains influences local weather patterns and, consequently, air quality. The surrounding landscape is a blend of agricultural land – primarily olive groves and cereal fields – and scrubland, typical of the Tell region. The urban character of Chaabat el Leham is that of a small, relatively low-density town, with a population of around 14,730. It exhibits a gradual urban-rural gradient, transitioning quickly into agricultural areas and then into the foothills of the Atlas range. The Mediterranean Sea lies a short distance to the north, providing a moderating influence on temperatures but also a potential source of sea salt aerosols, which can impact air quality. While Chaabat el Leham itself lacks major industrial zones, it benefits from its position within a broader regional network, with larger industrial areas located further inland. This means that pollutants generated elsewhere can be transported to the town, particularly during periods of calm winds. The elevation, though modest, contributes to localized temperature inversions, especially during cooler months, trapping pollutants closer to the ground. The town’s location within a relatively sheltered valley also limits wind dispersion, further exacerbating potential air quality issues.

The air quality in Chaabat el Leham follows a distinct seasonal pattern dictated by the region’s Mediterranean climate. During the warmer months (June-August), a combination of high temperatures and reduced rainfall leads to increased photochemical smog formation. Solar radiation drives reactions between pollutants, creating ozone and other secondary pollutants. The dry conditions also contribute to dust resuspension from agricultural fields, further degrading air quality. Conversely, the cooler, wetter months (November-February) generally see improved air quality. Rainfall effectively ‘washes’ pollutants from the atmosphere, and increased wind speeds, often associated with Mediterranean storms, help disperse them. However, periods of calm weather during these months can lead to temperature inversions, trapping pollutants in a shallow layer near the ground, particularly in the mornings. Spring (March-May) and Autumn (September-October) represent transitional periods, with fluctuating wind patterns and varying levels of rainfall. Fog, common during the cooler months, can also significantly reduce visibility and trap pollutants. Sensitive groups, such as children, the elderly, and individuals with respiratory conditions, should be particularly cautious during the summer months and on days with stagnant air or fog. Outdoor activities are generally best enjoyed during the wetter months or on days with moderate winds. Agricultural burning, a common practice in the surrounding areas, can also contribute to localized air pollution events, particularly during the harvest season. Careful monitoring of local weather conditions is advisable for anyone planning extended periods outdoors.