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Mediouna, nestled within the Casablanca-Settat region of Morocco, occupies a geographically significant position just south of Casablanca, Morocco’s largest city and economic hub. Located at approximately 33.45°N, 7.51°W, the town’s terrain is predominantly flat, characteristic of the coastal plains stretching along the Atlantic Ocean. Its proximity to the Atlantic exerts a considerable influence on local weather patterns and, consequently, air quality. The surrounding landscape is a blend of agricultural land, primarily dedicated to market gardening supplying Casablanca, and increasingly, light industrial and commercial zones expanding outwards from the metropolis. This urban-rural gradient is a key factor; Mediouna acts as a buffer zone, receiving some of the pollution emanating from Casablanca while also experiencing agricultural emissions. The elevation is relatively low, rarely exceeding 20 meters above sea level, which can exacerbate the trapping of pollutants during periods of temperature inversion. The coastal breezes, while generally beneficial for dispersion, can also carry pollutants from industrial areas further inland. The presence of the Oum Er-Rbia River, flowing nearby, contributes to local humidity and can influence fog formation, impacting air quality under certain conditions. The town’s location within a densely populated and rapidly developing region means it is susceptible to the cumulative effects of regional industrial activity and transportation emissions, making understanding its specific air quality challenges crucial.

Mediouna’s air quality experiences a distinct seasonal rhythm dictated by Morocco’s Mediterranean climate. The dry season, spanning roughly from April to October, typically sees higher pollution levels. Summer months (July-August) are characterized by intense sunshine and minimal rainfall, leading to stagnant air conditions and a propensity for temperature inversions, particularly during the early morning hours. These inversions trap pollutants close to the ground, intensifying their impact. Agricultural burning, a common practice in surrounding areas to clear fields after harvest, contributes significantly to particulate matter during this period. The autumn months (September-November) bring slightly improved conditions as winds increase, but lingering agricultural activity and the gradual cooling of the air can still lead to localized pollution episodes. Winter (December-February) generally offers the cleanest air due to increased rainfall, which naturally washes pollutants from the atmosphere, and stronger, more consistent winds that facilitate dispersion. However, fog, frequently occurring during winter mornings, can temporarily reduce visibility and trap pollutants. Spring (March-April) marks a transition period, with increasing temperatures and variable wind patterns. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the summer months, limiting outdoor activity during peak pollution hours. Avoiding strenuous exercise near agricultural areas during harvest season is also advisable. Maintaining awareness of local weather forecasts and air quality reports is essential for informed decision-making.