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Settat, nestled within the Casablanca-Settat region of Morocco, occupies a geographically significant position at approximately 33°N, -7.6°W. The city’s terrain is characterized by a gently undulating plain, part of the vast Haouz plain, a fertile agricultural zone surrounding Marrakech. This plain is a result of ancient alluvial deposits, creating relatively flat land punctuated by occasional low hills. Settat sits at an elevation of roughly 350 meters above sea level, influencing local weather patterns and air circulation. The surrounding landscape is predominantly agricultural, with extensive olive groves, cereal fields, and vineyards dominating the rural areas. This proximity to intensive agriculture contributes to seasonal particulate matter, particularly during harvest periods. To the west lies the Atlantic coast, approximately 60 kilometers away, which can influence humidity and occasionally introduce marine aerosols. The urban–rural gradient around Settat is gradual, with smaller villages and agricultural communities blending seamlessly into the city’s periphery. While not directly adjacent to major industrial zones, Settat benefits from its location within a region experiencing moderate industrial development, primarily centered around food processing and textiles. The city’s location within the Haouz plain, coupled with its moderate elevation and surrounding agricultural activity, creates a unique microclimate that can trap pollutants under certain meteorological conditions, impacting local air quality. The relatively flat topography limits natural dispersion of pollutants, especially during periods of low wind speed.

Settat’s air quality exhibits a distinct seasonal pattern dictated by its climate and surrounding land use. The dry season, spanning roughly from April to October, generally sees lower overall pollution levels due to increased wind speeds and solar radiation, which aids in pollutant dispersion. However, dust storms originating from the Sahara Desert are a recurring concern during the late spring and summer months (May-July), significantly elevating particulate matter concentrations. Agricultural activities, particularly harvesting, also contribute to particulate pollution during this period. The wet season, from November to March, brings cooler temperatures and increased rainfall, which naturally helps to cleanse the atmosphere. However, periods of prolonged calm and temperature inversions, common during the winter months (December-January), can trap pollutants near the ground, leading to localized air quality degradation. Fog, while infrequent, can exacerbate this effect. The months of June and September, coinciding with peak agricultural activity and the transition between seasons, often present the most challenging periods for air quality. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during these times, limiting outdoor exertion and monitoring local air quality reports. During the dust storm season, wearing a properly fitted mask is advisable. The cooler, wetter months generally offer improved air quality, but vigilance during periods of stagnant air is still recommended. Maintaining green spaces within the city and promoting sustainable agricultural practices are crucial for mitigating seasonal air quality fluctuations.