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Nestled in the fertile Büyük Menderes River valley in western Turkey, Aydın occupies a strategic position between the Aegean coast and the mountainous interior of Anatolia. The city sits at approximately 65 meters above sea level, with the Aydın Mountains rising dramatically to the north and the Menderes River meandering through its urban fabric. This valley location creates a distinct microclimate where air masses can become trapped, particularly during stable atmospheric conditions. Aydın serves as the administrative and economic hub of its namesake province, characterized by a blend of historic Ottoman architecture and modern urban development spreading across the valley floor. The surrounding landscape transitions from intensive agricultural zones—notably olive groves, fig orchards, and cotton fields—to forested hillsides, creating an urban–rural gradient where pollution sources shift from vehicular emissions and residential heating in the city center to agricultural burning and dust from unpaved roads in peri-urban areas. Proximity to the Aegean Sea, about 50 kilometers to the west, moderates temperatures but also influences wind patterns that can either disperse or concentrate pollutants depending on seasonal variations. The city's position along major transportation corridors connecting İzmir to Denizli adds to traffic-related emissions, while its role as a regional service center means industrial activity is present but less concentrated than in Turkey's larger metropolitan areas.

In spring, Aydın experiences moderate air quality as increasing temperatures and occasional rainfall help cleanse the atmosphere, though pollen from the region's abundant olive and pine trees can aggravate respiratory conditions. Summer brings the cleanest air of the year, with consistent northerly winds (the meltem) from the Aegean Sea effectively dispersing pollutants, making June through August ideal for outdoor activities despite high temperatures. Autumn sees a gradual deterioration in air quality as temperatures drop and atmospheric stability increases, with October and November particularly prone to temperature inversions that trap pollutants near the valley floor. Winter presents the most challenging conditions, with December through February marked by frequent thermal inversions in the Büyük Menderes Valley, where cold air becomes trapped beneath warmer layers, concentrating emissions from residential heating (often using coal or wood) and vehicular traffic. Sensitive groups including children, elderly residents, and those with pre-existing respiratory or cardiovascular conditions should limit prolonged outdoor exposure during winter mornings when inversion layers are strongest. The absence of significant industrial pollution sources means Aydın's air quality challenges are primarily meteorological and related to seasonal energy use patterns rather than year-round industrial emissions.