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Bhalil, nestled within the Fès-Meknès region of Morocco, occupies a geographically significant position at approximately 33.85°N, 4.87°W. The city’s terrain is characterized by gently rolling hills, typical of the Middle Atlas foothills, with an elevation of around 550 meters above sea level. This location places Bhalil within a transitional zone between the fertile plains of the Saïs region and the more rugged mountainous interior. The surrounding landscape is a mosaic of agricultural fields – primarily olive groves and cereal crops – interspersed with scattered woodlands and traditional Moroccan villages. The proximity to Fès, a major urban center and industrial hub, is a crucial factor influencing Bhalil’s air quality. While Bhalil itself is a relatively small settlement with a population of just over 13,000, it experiences the indirect impacts of Fès’s industrial activity and vehicular traffic. The urban–rural gradient is relatively sharp; Bhalil maintains a distinctly rural character, with traditional housing and agricultural practices dominating, yet it is undeniably influenced by the larger urban area nearby. The absence of major rivers or lakes within immediate proximity means that natural air purification processes through water bodies are limited. Prevailing winds generally flow from the northwest, carrying potential pollutants from Fès and the surrounding agricultural areas, impacting Bhalil’s atmospheric conditions. The topography, with its gentle slopes, can also contribute to localized air stagnation under certain meteorological conditions, exacerbating pollution episodes.

Bhalil’s air quality experiences a distinct seasonal cycle dictated by Morocco’s Mediterranean climate. The dry season, spanning roughly from April to October, typically sees the highest pollution concentrations. During these months, reduced rainfall and increased temperatures lead to a build-up of particulate matter and ozone, particularly during periods of intense sunshine. Agricultural practices, including burning of crop residues after harvest (often in late summer/early autumn), contribute significantly to localized pollution events. The months of July and August are generally the most challenging, with stagnant air masses and high temperatures creating conditions ripe for pollutant accumulation. Conversely, the wet season (November to March) brings relief, with rainfall effectively scrubbing the atmosphere and reducing particulate concentrations. However, even during the wet season, periods of cold, clear nights can lead to temperature inversions, trapping pollutants near the ground. Fog, more common in the winter months, can also exacerbate air quality issues by reducing atmospheric dispersion. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the dry season, particularly during periods of agricultural burning. Limiting outdoor exertion during peak sunlight hours and avoiding areas with visible smoke are advisable. The spring months (April-May) offer a transitional period with improving air quality as rainfall increases and agricultural burning decreases, making them generally more favourable for outdoor activities.