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Khelil is situated within the Bordj Bou Arréridj province, nestled in the high plateaus of northern Algeria. This region serves as a critical geographic transition between the humid coastal Tell Atlas mountains and the expansive arid reaches of the Sahara Desert. The terrain is characterized by undulating plains and rolling hills, which create a complex interplay of wind patterns and atmospheric trapping. Positioned at a moderate elevation, Khelil experiences a semi-arid climate where the landscape is dominated by cereal cultivation and livestock grazing, creating a distinct urban-rural gradient. The town's urban character is modest, blending residential clusters with agricultural peripheries. Because it lacks proximity to large bodies of water, there is little maritime moderation to cleanse the air, leaving the atmosphere susceptible to stagnant conditions. The regional position is influenced by the proximity to industrial hubs in the provincial capital, where electronic manufacturing and logistics contribute to a baseline of particulate matter. Furthermore, the surrounding agricultural zones introduce seasonal organic aerosols through soil tilling and crop residue burning. The geography essentially forms a basin-like effect in certain micro-climates, where pollutants from local traffic and heating systems can accumulate during periods of atmospheric stability. This structural arrangement makes the air quality highly dependent on the strength of the prevailing winds, which either disperse pollutants toward the highlands or trap them within the valley floors, directly impacting the respiratory health of the resident population.

Air quality in Khelil follows a rigorous seasonal rhythm dictated by the North African climate. During the summer, the dominant meteorological threat is the Sirocco, a scorching, dust-laden wind blowing from the Sahara. These events trigger massive spikes in coarse particulate matter, reducing visibility and compromising lung function. Conversely, autumn brings a period of relative clarity as Mediterranean depressions introduce moisture and wind, scrubbing the atmosphere of summer dust. Winter presents a different challenge; as temperatures drop, the region is prone to thermal inversions. Cold air becomes trapped beneath a layer of warmer air, pinning pollutants from domestic heating and vehicle exhausts close to the ground. This stagnation often leads to peak pollution levels in December and January, making these months hazardous for asthma sufferers and the elderly. Spring acts as a volatile transition period, where erratic winds can either clear the air or bring intermittent sandstorms before the summer heat settles. For outdoor activities, the late autumn and early spring months are generally most favorable, offering the cleanest air and mildest temperatures. Sensitive groups should strictly limit outdoor exertion during the height of the Sirocco in July and August, as well as during foggy, windless winter mornings when smog concentrations are highest. By monitoring these meteorological shifts, residents can better navigate the seasonal hazards of the high plateaus, ensuring that high-risk activities are avoided during the predictable peaks of mineral dust and winter atmospheric stagnation.