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Sahel, nestled within Morocco’s Tanger-Tétouan-Al Hoceïma region, occupies a strategically important position on the northwestern coast, a gateway between the Mediterranean and the Atlantic. Its coordinates (34.9667, -4.5500) place it within a gently sloping coastal plain, transitioning rapidly to the foothills of the Rif Mountains to the east. The city’s terrain is characterized by relatively flat land close to the coast, gradually rising as it approaches the mountainous backdrop. This proximity to the Rif Mountains significantly influences local weather patterns and, consequently, air quality. The surrounding landscape is a mosaic of agricultural fields – primarily olive groves and cereal crops – interspersed with small villages and pockets of cork oak forest. Sahel’s urban-rural gradient is relatively sharp; the city itself is compact, with a clear delineation between built-up areas and the surrounding rural agricultural zones. The Atlantic Ocean lies a short distance to the west, providing a moderating influence on temperatures but also a potential source of maritime pollutants. While not directly adjacent to major industrial belts, Sahel benefits from its proximity to larger urban centers like Tangier, which can indirectly impact air quality through transported pollutants. The prevailing winds, often originating from the Atlantic, play a crucial role in dispersing or concentrating pollutants within the local area, creating a dynamic and location-specific air quality profile. The elevation, though modest, contributes to localized variations in temperature and humidity, further impacting atmospheric stability and pollutant dispersion.

Sahel’s air quality experiences a distinct seasonal rhythm dictated by its Mediterranean climate. The dry summer months (June-August) typically see the highest concentrations of particulate matter, largely due to agricultural activities like harvesting and the increased prevalence of dust storms originating from the Sahara Desert. Strong, hot winds can exacerbate this, trapping pollutants close to the ground and hindering dispersion. Temperature inversions, common during these months, further contribute to poor air quality by preventing vertical mixing. Spring (March-May) and Autumn (September-November) offer more favourable conditions, with moderate temperatures and increased rainfall helping to cleanse the atmosphere. However, agricultural burning practices during these periods can still lead to localized spikes in pollution. Winter (December-February) is generally the cleanest period, characterized by cooler temperatures, more frequent rainfall, and stronger winds that effectively disperse pollutants. Fog, however, can occasionally form, trapping pollutants near the surface. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the summer months, limiting outdoor activities during peak heat and dust events. During the harvest season (primarily autumn), it’s advisable to avoid areas with significant agricultural burning. Maintaining awareness of local weather forecasts and air quality reports is crucial for making informed decisions about outdoor exposure throughout the year. The interplay of Atlantic winds, mountain influences, and agricultural practices creates a complex and seasonally variable air quality landscape in Sahel.