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Steha, nestled within the Tanger-Tétouan-Al Hoceïma region of Morocco, occupies a geographically complex position at approximately 35.3646° N, -4.9306° W. The city’s location, though small with a population of 11,452, is significant due to its proximity to the Rif Mountains and the Mediterranean Sea. This interplay of mountain terrain and coastal influence profoundly shapes its microclimate and, consequently, its air quality. The surrounding landscape is characterized by rugged hills and valleys, typical of the Rif Mountains, which can trap pollutants under certain meteorological conditions. Steha sits at a relatively modest elevation, which, while not extreme, contributes to localized temperature inversions, particularly during cooler months. The Mediterranean Sea provides a moderating influence on temperatures, but also introduces saline aerosols and potential for coastal fog, impacting visibility and potentially contributing to secondary particulate matter formation. The urban-rural gradient around Steha is gradual, transitioning from small settlements and agricultural land to more extensive mountain slopes. While not directly adjacent to major industrial belts, the region supports some agricultural activity, including olive groves and cereal farming, which can contribute to seasonal dust and ammonia emissions. The prevailing winds, often originating from the northwest, play a crucial role in dispersing pollutants, but their effectiveness is variable depending on the topography and atmospheric stability. The city's relatively isolated location, while offering some protection from large-scale industrial pollution, also means it is susceptible to localized sources and the impacts of regional weather patterns.

Steha’s air quality experiences a distinct seasonal cycle driven by meteorological factors and regional influences. During the warmer months (June-August), the prevailing northwest winds generally provide good ventilation, dispersing pollutants and leading to relatively cleaner air. However, periods of stagnant air, particularly during heatwaves, can result in localized increases in ozone and particulate matter. The dry climate minimizes rainfall, reducing the natural cleansing effect of precipitation. Autumn (September-November) often sees a gradual decline in air quality as temperatures cool and wind speeds decrease. This period is prone to temperature inversions, where a layer of warm air traps cooler air near the ground, preventing the vertical mixing of pollutants. Winter (December-February) typically presents the most challenging air quality conditions. Cold, stable air masses combined with frequent fog events exacerbate pollution trapping. Agricultural burning, though regulated, can also contribute to particulate matter during this season. Spring (March-May) marks a gradual improvement as temperatures rise and winds increase, though dust storms originating from the Sahara can occasionally impact air quality. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the autumn and winter months, limiting outdoor activity during periods of fog or stagnant air. Maintaining indoor air quality through ventilation and air purification can also be beneficial. Awareness of regional weather forecasts and potential dust events is crucial for minimizing exposure.