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Medroussa, nestled within the Tiaret State of Algeria, occupies a geographically significant position in the northwestern foothills of the Tell Atlas Mountains. Located at approximately 35.1667° latitude and 1.2000° longitude, the city’s elevation, around 800 meters above sea level, contributes to its relatively cool climate and influences local air circulation patterns. The surrounding landscape is characterized by a blend of semi-arid steppe and mountainous terrain, transitioning into more rugged highlands further east. This topography creates a rain shadow effect, limiting precipitation and fostering drier conditions. While Medroussa lacks immediate proximity to major bodies of water, it benefits from the influence of the Mediterranean Sea, approximately 200 kilometers to the north, which moderates temperatures and can occasionally introduce maritime air masses. The urban fabric of Medroussa is relatively compact, reflecting its smaller population of 11,428. The city’s immediate surroundings are primarily agricultural, with olive groves and cereal crops dominating the rural landscape. A gradual urban-rural gradient extends outwards, eventually giving way to more extensive pastoral areas and the steeper slopes of the Atlas Mountains. The region’s industrial activity is limited, primarily focused on small-scale agricultural processing and local crafts, minimizing direct industrial pollution sources. However, agricultural practices, including the use of fertilizers and occasional burning of crop residues, can contribute to localized air quality concerns. The mountainous terrain can also trap pollutants, particularly during periods of calm weather, impacting air quality within the city itself.

Medroussa’s air quality experiences a distinct seasonal cycle dictated by its Mediterranean climate and the surrounding topography. Spring (March-May) generally offers the most favourable conditions, with increasing temperatures and more frequent wind events that help disperse pollutants. However, dust storms originating from the Sahara Desert can occasionally impact air quality during this period, reducing visibility and increasing particulate matter. Summers (June-August) are characterized by high temperatures and prolonged periods of calm weather, often leading to temperature inversions where cooler air becomes trapped beneath a layer of warmer air. This inversion layer inhibits vertical mixing, trapping pollutants near the ground and potentially exacerbating air quality issues. Agricultural activities, such as fertilizer application, may also contribute to elevated levels of ammonia and other agricultural pollutants. Autumn (September-November) sees a gradual cooling and increased rainfall, which helps to cleanse the atmosphere. Wind patterns become more variable, aiding in pollutant dispersion. Winter (December-February) is typically the most challenging season for air quality. Cold temperatures and frequent fog events reduce atmospheric mixing, while domestic heating, often reliant on solid fuels, can contribute to localized pollution. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during winter months and periods of stagnant air, limiting outdoor exertion and ensuring adequate ventilation. Spring and autumn offer the best windows for outdoor activities, but vigilance regarding dust storms and agricultural practices remains important.