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Ben Guerir sits on the high plains of the Rehamna province, acting as a strategic bridge between the coastal hubs of Casablanca and the interior tourism of Marrakech. The city is characterized by a semi-arid landscape, where the terrain is predominantly flat, consisting of limestone plateaus and sparse scrubland. This geographic openness exposes the urban center to significant aeolian processes, meaning wind-borne dust is a constant presence. The urban character is uniquely split between traditional residential quarters and the ultra-modern, sustainable campus of the Mohammed VI Polytechnic University, creating a sharp urban–rural gradient. The regional economy is dominated by the OCP Group, with phosphate mining and processing facilities forming an industrial belt that directly influences the local atmospheric composition. Because the city lacks significant bodies of water or high mountain barriers to trigger precipitation or scrub the air, pollutants often linger during stagnant weather periods. The surrounding agricultural zones contribute organic particulate matter, especially during harvest seasons, while the sparse vegetation provides little filtration against the mineral dust of the Moroccan interior. Consequently, the city's air quality is a complex intersection of industrial emissions from the phosphate sector and natural particulate matter derived from the arid soil. This positioning makes Ben Guerir particularly susceptible to the influence of regional wind patterns, which can either disperse industrial plumes or trap them within the lower boundary layer of the atmosphere. Moreover, the elevation of the plateau contributes to a specific thermal regime that influences how pollutants settle.

In Ben Guerir, air quality fluctuates according to a semi-arid seasonal cycle. During the summer, the dominant factor is the Chergui, a hot, dry wind blowing from the Sahara. These events trigger spikes in coarse particulate matter as sand and dust saturate the air, often reducing visibility and aggravating respiratory conditions. Consequently, mid-summer is the most challenging period for outdoor activity, and sensitive groups should remain indoors during dust storms. Autumn brings a transition where cooling temperatures can lead to early morning temperature inversions, trapping industrial emissions from phosphate processing near the ground. Winter is generally the clearest season, as occasional rainfall scrubs the atmosphere of particulates and suppresses dust. However, the increased use of biomass for heating in rural outskirts can lead to localized smoke pollution during the coldest months. Spring is a period of volatility, characterized by shifting winds that may transport agricultural pollutants from nearby farms. For those with asthma or chronic obstructive pulmonary disease, the transition from winter to spring is particularly risky due to the combination of rising pollen counts and returning wind-borne dust. To optimize health, outdoor exercise is best scheduled for the late autumn or winter months when the air is freshest. Residents are advised to monitor wind directions, as the prevailing northeasterlies often dictate the movement of industrial plumes across the urban landscape, necessitating caution during periods of atmospheric stagnation. This cyclical pattern defines the city's respiratory health profile.