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Skopje, the capital of North Macedonia, occupies a strategic position in the Balkan Peninsula, nestled within the Skopje Valley along the Vardar River. This valley, flanked by the Šar Mountains to the west and the Osogovo Mountains to the east, creates a distinctive basin topography that profoundly influences the city's air quality. Situated at an elevation of approximately 240 meters above sea level, Skopje's urban character blends historic Ottoman-era architecture in the Old Bazaar with Soviet-style developments and modern infrastructure, creating a dense urban core that extends into suburban and rural peripheries. The Vardar River, flowing through the city centre, provides a natural corridor but does little to disperse pollutants. The valley's enclosed geography acts as a natural trap, preventing the efficient dispersion of airborne contaminants from multiple sources. Industrial zones, particularly in the northern and eastern sectors, contribute emissions that mingle with vehicle exhaust from the city's congested road network. Residential areas, especially in poorer neighbourhoods, rely heavily on wood and coal heating during colder months, adding particulate matter to the already burdened atmosphere. The urban–rural gradient sees pollution concentrations diminish towards the surrounding agricultural lands and foothills, but the basin effect ensures that even these areas experience elevated levels during stagnation events. This geographic setting, combined with the city's role as North Macedonia's economic and transportation hub, creates a persistent air quality challenge exacerbated by the terrain's natural containment.

Skopje's air quality follows a pronounced seasonal pattern, with pollution levels peaking dramatically during the winter months from November through February. During this period, cold temperatures drive increased residential burning of wood and coal for heating, while temperature inversions—common in the valley's basin—trap pollutants close to the ground. These meteorological conditions, coupled with low wind speeds and frequent fog, create hazardous smog episodes that can persist for days. Sensitive groups, including children, the elderly, and those with respiratory or cardiovascular conditions, are advised to limit outdoor activities, especially during morning and evening hours when inversion layers are strongest. Spring brings gradual improvement as temperatures rise and precipitation increases, helping to wash pollutants from the air, though construction dust and road dust resuspension can cause intermittent spikes. Summer offers the cleanest air, with warmer temperatures reducing heating emissions and more frequent breezes providing some dispersion, though industrial and vehicle emissions remain present. Autumn sees a return to deteriorating conditions as temperatures drop and heating season begins, with October often serving as a transition month. For visitors and residents seeking outdoor activities, the summer months of June through August are most favourable, while winter requires careful planning and use of protective measures like masks during high-pollution days.