Selmane, nestled within the M’sila Province of Algeria, occupies a geographically significant position in the country’s central region. Located at approximately 35.68°N, 4.78°E, the city’s terrain is characterized by a gently undulating landscape, typical of the Tell Atlas foothills. The elevation, around 750 meters above sea level, contributes to a unique microclimate and influences local air circulation patterns. Selmane sits within a transitional zone, bridging the fertile plains of the Mitidja plain to the north and the more arid steppes of the Algerian Sahara to the south. This proximity to both agricultural lands and the desert edge creates a complex interplay of potential pollution sources. The surrounding landscape is predominantly agricultural, with olive groves, cereal fields, and vineyards defining the rural character. While Selmane itself is a relatively small urban center with a population of approximately 33,851, it serves as a regional hub for surrounding villages, increasing traffic and associated emissions. The urban–rural gradient is gradual, with agricultural activities seamlessly blending into the town’s periphery. The absence of major rivers or lakes within immediate proximity means Selmane relies on groundwater resources, and the lack of significant water bodies limits natural air purification processes. The region's position within a broader industrial belt, though not directly adjacent, means that pollutants from larger industrial centers can be transported by prevailing winds, impacting Selmane’s air quality. The topography, with its gentle slopes, can also contribute to localized air stagnation under certain meteorological conditions.

Selmane’s air quality experiences a distinct seasonal cycle dictated by Algeria’s Mediterranean climate. Spring (March-May) generally offers the most favourable conditions, with increasing temperatures and strengthening winds that help disperse pollutants. However, dust storms originating from the Sahara can occasionally impact air quality during this period, reducing visibility and increasing particulate matter. Summer (June-August) is typically characterized by high temperatures and prolonged periods of calm air, which can lead to temperature inversions, trapping pollutants near the ground. This stagnation, coupled with agricultural activities like burning crop residue, can result in elevated levels of certain pollutants. Autumn (September-November) sees a gradual improvement in air quality as temperatures cool and winds increase, though agricultural burning may still be a factor. Winter (December-February) presents a mixed picture. While cooler temperatures can reduce photochemical smog formation, frequent fog and low-lying cloud cover can trap pollutants, particularly during periods of stagnant air. The months of July and August are generally those to avoid for prolonged outdoor activity, especially for vulnerable populations like children, the elderly, and individuals with respiratory conditions. During these months, limiting strenuous outdoor exercise and ensuring adequate ventilation indoors is advisable. Throughout the year, awareness of wind direction and local weather forecasts can help individuals make informed decisions about outdoor activities. Individuals with pre-existing respiratory illnesses should consult their healthcare providers for personalized advice and consider wearing masks during periods of poor air quality.