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Ait Ali, nestled within Morocco’s Souss-Massa region at coordinates 30.1765, -9.4886, presents a fascinating case study in urban geography and air quality. The city sits approximately 20km inland from the Atlantic coast, benefiting from maritime influences but also experiencing a degree of isolation from direct coastal breezes due to intervening hills. The terrain is characterised by a gentle slope rising eastward towards the Anti-Atlas Mountains, creating localized microclimates and influencing pollutant dispersion. Ait Ali’s urban character is typical of a Moroccan provincial centre, with a mix of traditional residential areas and more modern development. Surrounding the city is a predominantly agricultural landscape, dominated by citrus groves, argan trees, and vegetable farms. This agricultural activity, while economically vital, contributes to potential air quality issues through the use of pesticides and fertilizers, and seasonal burning of agricultural waste. The urban-rural gradient is relatively sharp, with significant open land immediately surrounding the built-up area. The proximity to the Atlantic provides some atmospheric cleansing, but prevailing winds can also carry pollutants from coastal industrial zones, particularly during temperature inversions. The city’s elevation, around 200m above sea level, further influences atmospheric stability and pollutant concentration.

Air quality in Ait Ali experiences a distinct seasonal rhythm. Winter (December-February) often sees poorer air quality due to temperature inversions trapping pollutants from domestic heating – wood and charcoal burning are common. Calm conditions and increased humidity exacerbate this, leading to a build-up of particulate matter. Spring (March-May) brings improvement as winds increase and rainfall washes away accumulated pollutants, though agricultural burning can cause temporary spikes. Summer (June-August) is generally the clearest period, with consistent sea breezes dispersing pollutants and high temperatures promoting atmospheric mixing. However, dry conditions can lead to increased dust levels, particularly from surrounding agricultural land. Autumn (September-November) marks a transition, with decreasing wind speeds and the resumption of heating, leading to a gradual decline in air quality. Sensitive groups – children, the elderly, and those with respiratory conditions – should be particularly cautious during winter and autumn. Months to avoid strenuous outdoor activity are December, January, and November. Conversely, June, July, and August generally offer the most favourable conditions. Fog, common in the mornings during winter, can also trap pollutants, reducing visibility and worsening respiratory symptoms.