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Dar el Beïda, nestled within the Algiers province of Algeria, presents a unique geographic context influencing its air quality. Situated at coordinates 36.7142, 3.2125, the city occupies a coastal position along the Mediterranean Sea, approximately 15km east of Algiers city centre. The terrain is characterised by a mix of rolling hills and plains, gradually ascending inland. This proximity to the sea moderates temperatures but also creates conditions for humidity and potential salt spray. Dar el Beïda’s urban fabric is increasingly dense, reflecting Algeria’s broader urbanisation trends, with a population of 81,509. The surrounding landscape is a blend of residential areas, small-scale agriculture – primarily olive groves and citrus farms – and emerging industrial zones concentrated further inland towards Rouiba. The urban-rural gradient is relatively sharp, transitioning quickly to more sparsely populated areas. Air quality is particularly affected by prevailing winds carrying pollutants from the larger Algiers metropolitan area and industrial activity to the south and west. The city’s location within a natural bowl-shaped depression can also contribute to localised air stagnation, trapping pollutants during calm weather conditions. Topography and sea breezes interact to create complex airflow patterns.

Dar el Beïda experiences a Mediterranean climate, with distinct seasonal variations impacting air quality. Summer (June-August) often sees relatively cleaner air due to consistent north-easterly breezes dispersing pollutants offshore, though ozone levels can rise with intense sunlight. However, increased traffic during the holiday season can locally degrade air. Autumn (September-November) brings a transition period, with decreasing wind speeds and the potential for temperature inversions, trapping pollutants closer to the ground. This is often when dust from the Sahara Desert is transported northward, contributing to particulate matter. Winter (December-February) is typically the wettest season, with rainfall helping to scrub the air, but calm conditions and increased heating fuel use can lead to localised pollution spikes, particularly from residential sources. Spring (March-May) is a period of fluctuating conditions, with increasing temperatures and potential for dust storms. Sensitive individuals – children, the elderly, and those with respiratory conditions – should be particularly cautious during autumn and winter. Avoiding strenuous outdoor activity during periods of calm weather and dust events is advisable. Monitoring local conditions and staying indoors when pollution is noticeable is crucial for protecting health.