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Sefrou, nestled within the Fès-Meknès region of Morocco, occupies a geographically significant position at approximately 33°N, 49°W. The city’s urban fabric is intimately interwoven with the surrounding landscape, dramatically shaped by the Zerhoun Mountains which rise sharply to the south and east. This mountainous terrain creates a natural basin, influencing local wind patterns and contributing to potential air quality challenges. Sefrou sits at an elevation of around 687 meters (2,254 feet) above sea level, a factor that can affect atmospheric stability and pollutant dispersion. The city is situated along the Oued Aggai, a seasonal river that provides a vital water source and influences the local microclimate. The surrounding area is characterized by a gradual urban-rural gradient, transitioning from the built environment of Sefrou to agricultural lands and olive groves, a significant economic driver for the region. While not directly adjacent to major industrial belts, Sefrou’s proximity to Fès, a larger industrial and commercial hub, means it can be affected by transboundary pollution. The terrain’s topography, combined with the seasonal river and agricultural practices, creates a complex interplay of factors that impact air quality, particularly concerning particulate matter and agricultural emissions. The basin effect can trap pollutants, especially during periods of low wind, while agricultural burning, though regulated, can contribute to localized spikes in air pollution.

Sefrou’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 a build-up of particulate matter, often stemming from agricultural activities like harvesting and olive processing, as well as dust storms originating from the Sahara. Summer months (July-August) are particularly challenging, with stagnant air and frequent temperature inversions trapping pollutants close to the ground. The cooler, wetter months (November-March) generally offer improved air quality. Increased rainfall effectively ‘washes’ pollutants from the atmosphere, and stronger northerly winds help disperse them. However, periods of fog, common during the winter, can temporarily reduce visibility and trap pollutants, creating localized pockets of poor air quality. Spring (April-May) marks a transition period, with increasing temperatures and decreasing rainfall leading to a gradual rise in pollution levels. Individuals with respiratory conditions, such as asthma, should exercise caution during the dry season, particularly during periods of agricultural activity or dust storms. Children and the elderly are also more vulnerable and should limit prolonged outdoor exposure during peak pollution times. Maintaining indoor air quality through ventilation and air purifiers can provide some relief. The city’s location within a basin exacerbates these seasonal trends, making awareness of weather patterns and potential pollution sources crucial for public health.