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Souahlia is nestled within the Tlemcen province of northwestern Algeria, positioned in a transitional zone where the rugged Tell Atlas mountains begin to flatten into fertile agricultural plains. This specific location grants the town a semi-rural character, characterized by a low-density urban fabric interspersed with expansive olive groves and cereal fields. The elevation is moderate, which generally allows for a steady flow of Mediterranean breezes; however, the undulating terrain can create localized pockets of stagnant air, particularly in the lower depressions where pollutants tend to settle. Being situated away from the heavy industrial corridors of Algiers or Oran, Souahlia’s primary anthropogenic emissions stem from localized agricultural machinery and regional vehicular transit. The surrounding landscape is a mosaic of scrubland and cultivated plots, which acts as a natural filter for particulate matter, yet also introduces organic aerosols during harvesting seasons. The proximity to the Mediterranean coast ensures a tempering influence on the climate, but the town remains susceptible to the influence of the Sahara to the south. This geographical duality means that air quality is often a battle between the cleansing effect of moist maritime air and the influx of mineral dust. The urban-rural gradient is sharp, with the town center serving as a hub for the surrounding hamlets, concentrating traffic emissions in a small core while the periphery remains relatively pristine, provided that seasonal agricultural burning is kept under control throughout the calendar year. This unique positioning defines its profile.

In Souahlia, air quality follows a distinct Mediterranean rhythm, heavily influenced by the interplay of Atlantic moisture and Saharan heat. During the winter months, the town experiences its cleanest air as frequent rainfall washes atmospheric particulates from the sky. However, cold temperature inversions can occasionally trap wood-smoke from residential heating near the ground, creating localized smog in the valleys. Spring brings a transition, where shifting wind patterns often introduce the Sirocco, a hot, dry wind from the south that carries vast quantities of mineral dust, causing spikes in particulate matter. These dust events can linger for days, necessitating that sensitive groups, such as asthmatics, limit outdoor exertion. Summer is characterized by intense solar radiation and stagnant air, which facilitates the formation of ground-level ozone, particularly during heatwaves when photochemical reactions peak. This period is the most challenging for respiratory health, and outdoor activities are best scheduled for the early morning or late evening. Autumn provides a welcome respite as the first rains arrive, scrubbing the atmosphere and reducing the ozone levels. The most favorable period for outdoor activity is generally late autumn and early winter, when the air is crisp and visibility is highest. For elderly residents and children, monitoring the wind direction is crucial; southerly winds typically signal a decline in air quality, while northerly breezes from the sea bring refreshing, purified air that effectively clears the urban canopy quickly. This cycle ensures that air quality remains dynamic across the year.