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L’Oulja, nestled within the Fès-Meknès region of Morocco, occupies a geographically significant position at approximately 34.2894° N, -4.9481° W. The city’s terrain is characterized by rolling hills and valleys, typical of the Middle Atlas mountains, with an elevation of around 850 meters above sea level. This elevation, while offering scenic views, contributes to a localized basin effect, potentially trapping pollutants under certain meteorological conditions. L’Oulja sits on the periphery of the fertile Saïs Plain, a historically important agricultural zone known for its cereal production and fruit orchards. This proximity to agricultural lands introduces potential sources of particulate matter, particularly during harvest seasons when burning of crop residues can occur. The city’s urban fabric is relatively compact, exhibiting a gradual urban-rural gradient as one moves outwards, transitioning to olive groves and small farming communities. While L’Oulja is not directly adjacent to a major river, it benefits from occasional rainfall runoff from the surrounding mountains. The regional climate is semi-arid, influencing vegetation patterns and evaporation rates. Further afield, the industrial belt surrounding Fès, Morocco’s second-largest city, exerts an indirect influence, with potential for long-range transport of pollutants. The surrounding landscape is dominated by scrubland and coniferous forests, which can act as both a carbon sink and a source of biomass burning during dry periods, impacting local air quality.

L’Oulja’s air quality experiences a distinct seasonal cycle dictated by its Mediterranean climate. The dry season, spanning roughly from April to October, typically sees the highest pollution levels. During these months, reduced rainfall and increased temperatures contribute to stagnant air conditions, particularly during the summer months (July-August). Temperature inversions, common in the region, trap pollutants close to the ground, exacerbating the problem. Agricultural practices, including the burning of agricultural waste after harvest, are a significant contributor during this period. The autumn months (September-October) can also experience elevated particulate matter due to the continued burning and the onset of cooler temperatures which can lead to fog formation, further hindering pollutant dispersion. The wet season, from November to March, brings relief with increased rainfall, which naturally washes pollutants from the atmosphere. However, periods of heavy rainfall can also lead to increased humidity and fog, which, while cleansing, can temporarily reduce visibility and trap moisture-bound pollutants. Winter (December-January) generally offers the best air quality, although occasional cold snaps can trigger localized wood-burning for heating, contributing to short-term spikes in particulate matter. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the dry season, particularly during periods of agricultural burning and temperature inversions. Limiting outdoor exertion during these times is advisable.