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Chetouane, nestled within the Tlemcen Province of Algeria, occupies a geographically significant position in the northwest of the country. Located at coordinates 34.9203°N, -1.2897°W, the city is situated in a landscape characterized by rolling hills and the foothills of the Rif Mountains. This terrain influences air quality by limiting atmospheric dispersion, creating localized pockets where pollutants can accumulate. The elevation, while not extreme, contributes to temperature inversions, particularly during calmer weather conditions. Chetouane isn’t directly on the coast, but is relatively close to the Mediterranean Sea, approximately 30km distant, which introduces maritime influences on local weather patterns. The surrounding area is a mix of agricultural land – primarily olive groves and vineyards – and increasingly, small-scale industrial activity related to food processing and light manufacturing. The urban-rural gradient is fairly sharp; the city itself is compact with a population of around 47,600, quickly transitioning to agricultural fields and then more rugged, mountainous terrain. Dust from agricultural practices and unpaved roads, combined with emissions from local industries and domestic heating, are key factors impacting the city’s air quality. The prevailing winds, often from the west, can transport pollutants from the coastal areas inland, affecting Chetouane.

Air quality in Chetouane experiences a distinct seasonal rhythm. Summer (June-August) often sees relatively cleaner air, driven by stronger winds that aid in pollutant dispersion and infrequent rainfall which helps to wash particulate matter from the atmosphere. However, high temperatures can exacerbate ozone formation, a secondary pollutant. Autumn (September-November) brings a transition period, with decreasing wind speeds and the onset of agricultural burning, leading to increased particulate matter concentrations. This is often the period when air quality begins to noticeably decline. Winter (December-February) is typically the most challenging time for air quality. Temperature inversions are frequent, trapping pollutants close to the ground, and domestic heating using wood and other solid fuels contributes significantly to particulate matter and carbon monoxide levels. Fog, common during these months, further reduces visibility and exacerbates pollution. Spring (March-May) sees a gradual improvement as temperatures rise and rainfall increases, but dust from agricultural activities remains a concern. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit strenuous outdoor activity during winter and autumn months. Monitoring wind patterns and avoiding peak burning times are crucial for mitigating exposure.