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El Ach, nestled within the Bordj Bou Arréridj province of Algeria, occupies a strategically significant position at approximately 35.95°N, 4.68°E. The city’s geography is dominated by the foothills of the Aurès Mountains, contributing to a varied terrain characterized by gentle slopes and pockets of rugged landscape. Situated at an elevation of roughly 1100 meters (3600 feet) above sea level, El Ach benefits from a relatively cool climate compared to lower-lying Algerian cities, but this elevation also influences local air circulation patterns. The surrounding landscape is a mosaic of semi-arid scrubland, olive groves, and small-scale agricultural plots, reflecting the region’s reliance on rain-fed farming. While El Ach itself is a relatively small urban center with a population of around 16,108, it lies within a broader agricultural zone, and the proximity to these fields can contribute to seasonal particulate matter from agricultural practices like burning crop residue. The urban–rural gradient is gradual, with small villages and agricultural areas blending seamlessly into the outskirts of the city. The absence of major rivers or lakes in the immediate vicinity limits the natural cleansing effect of water bodies on the air. Further afield, the larger industrial belt of Constantine, approximately 150km to the west, can occasionally influence El Ach’s air quality through long-range transport of pollutants, particularly during periods of atmospheric stability. The mountainous terrain can trap pollutants, especially during temperature inversions, exacerbating local air quality challenges.

El Ach’s air quality experiences a distinct seasonal cycle dictated by its Mediterranean climate and the surrounding topography. Spring (March-May) generally sees improved air quality as temperatures rise and winds increase, dispersing accumulated pollutants. However, agricultural burning, a common practice to prepare fields for planting, can introduce significant particulate matter during this period, creating localized air quality concerns. Summers (June-August) are typically drier and hotter, often leading to temperature inversions, particularly in the evenings. These inversions trap pollutants near the ground, potentially leading to stagnant air and increased concentrations of certain pollutants. The lack of rainfall during these months also limits natural cleansing. Autumn (September-November) brings a gradual shift, with cooler temperatures and increased rainfall, which helps to flush out pollutants. However, the transition period can be marked by periods of fog, which, while visually appealing, can also trap pollutants close to the ground. Winter (December-February) is often the most challenging season for air quality. Cold, stable air masses frequently settle in the valleys and around the foothills of the Aurès Mountains, creating persistent temperature inversions. These inversions, combined with reduced wind speeds, can lead to a build-up of pollutants. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should limit prolonged outdoor activity during winter mornings and evenings. Increased vigilance is also advised during spring agricultural burning periods. Maintaining indoor air quality through proper ventilation and air filtration can provide some relief during periods of poor air quality.