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Maghnia, nestled in the Tlemcen Province of Algeria, occupies a strategically important position within the northwestern region of the country. Located at approximately 34.86°N, 1.73°W, the city sits at an elevation of around 650 meters (2,133 feet) above sea level, contributing to a generally cooler climate compared to coastal areas. The surrounding landscape is characterized by a blend of fertile plains and the foothills of the Tell Atlas Mountains, a significant factor in local weather patterns and air circulation. Maghnia’s proximity to the Moroccan border (roughly 60km) influences regional trade and transportation routes, potentially impacting air quality through vehicular emissions. The urban fabric of Maghnia is a mix of traditional architecture and modern development, reflecting its historical role as an agricultural hub and a growing commercial center. The city’s location within a predominantly agricultural zone means that seasonal farming practices, including burning of crop residues, can contribute to localized air pollution episodes. The urban–rural gradient transitions relatively quickly, with agricultural land dominating the immediate periphery. The presence of olive groves and cereal fields shapes the regional landscape and introduces biogenic volatile organic compounds (BVOCs) into the atmosphere. Topographically, the valley setting can sometimes trap pollutants, particularly during periods of low wind speed. The absence of major industrial belts directly adjacent to Maghnia mitigates some pollution risks, although transportation corridors connecting the city to larger urban centers remain a source of concern.

Maghnia’s air quality experiences a distinct seasonal cycle dictated by its Mediterranean climate. The dry summer months (June-August) are often characterized by elevated particulate matter concentrations. High temperatures and reduced rainfall lead to increased dust levels, exacerbated by occasional Harmattan winds blowing from the Sahara. These winds can transport fine dust particles over considerable distances, impacting visibility and respiratory health. Temperature inversions, common during calm summer nights, trap pollutants near the ground, further degrading air quality. Conversely, the wetter months (October-March) generally see improved air quality due to increased rainfall, which naturally washes pollutants from the atmosphere. However, periods of prolonged fog, particularly in late autumn and early winter, can also lead to localized pollution build-up. Spring (April-May) brings a gradual improvement as temperatures rise and winds increase, dispersing pollutants. Agricultural activities, specifically the burning of crop residues after harvest in late summer and early autumn, contribute to localized spikes in smoke and particulate matter. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the summer months, limiting outdoor activity during peak heat and periods of high dust. During the wetter months, while overall air quality is better, individuals with allergies should be mindful of pollen levels. Maintaining indoor air quality through proper ventilation and air filtration is advisable throughout the year, especially during periods of elevated pollution.