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Zagora serves as a pivotal gateway to the Sahara, situated within the fertile yet fragile expanse of the Drâa Valley in southeastern Morocco. The urban character is defined by its symbiotic relationship with the surrounding palm groves, which create a verdant ribbon of life amidst a stark, arid plateau. Geographically, the town is cradled by the rugged foothills of the Anti-Atlas mountains, which act as a partial barrier to Atlantic moisture, cementing its hyper-arid classification. The terrain is characterized by sandy plains and rocky outcrops, with the intermittent flow of the Drâa River shaping the local hydrology. From an air quality perspective, Zagora’s position is precarious; it sits directly in the path of mineral dust transport from the deeper Sahara. The lack of significant water bodies nearby means there is little natural scrubbing of the atmosphere through precipitation. While the town lacks heavy industrial belts, the urban–rural gradient is marked by traditional agricultural practices, where the burning of organic waste in the palmeraies can introduce localized particulate matter. The elevation and open topography allow for high wind speeds, which simultaneously clear stagnant urban pollutants but frequently trigger massive dust storms. Consequently, the air quality is dominated by natural lithogenic aerosols rather than anthropogenic smog, making the atmospheric composition heavily dependent on the regional wind patterns and the stability of the surrounding desert soils, which are prone to aeolian erosion and frequent wind-driven mobilization of fine silt.

Air quality in Zagora follows a cyclical pattern dictated by the harsh desert climate and seasonal wind shifts. During the summer, the region experiences its most volatile period, as the hot, dry Chergui winds blow from the east, transporting vast quantities of Saharan sand and fine particulate matter. This leads to frequent spikes in dust concentration, reducing visibility and stressing the respiratory systems of the population. Conversely, the winter months bring a relative reprieve from dust, though the air can become stagnant. During cold snaps, nocturnal temperature inversions often trap localized emissions from domestic heating and small-scale agricultural burning close to the ground, creating a dense, low-level haze. Spring is a transition period characterized by unpredictable wind gusts that can trigger sudden dust events, while autumn usually offers the cleanest air as temperatures moderate and the atmosphere stabilizes before the winter chill. For sensitive groups, including children and the elderly, the peak summer months and the early spring transition are the most hazardous times for outdoor activity. It is highly recommended to remain indoors during active sandstorms or to use high-filtration masks to mitigate the inhalation of mineral dust. Health guidance emphasizes hydration and respiratory protection during the Chergui events. By monitoring wind directions and regional weather alerts, residents can better navigate these seasonal fluctuations, favoring the late autumn period for extended outdoor excursions when the air is typically most transparent and refreshing.