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Köşk, nestled in Aydın Province, Turkey, occupies a geographically significant position within the Büyük Menderes River Valley. Located at coordinates 37.8533, 28.0517, the town’s terrain is predominantly flat, characteristic of alluvial plains formed by the river’s deposition over millennia. This relatively low elevation, averaging around 45 meters above sea level, contributes to a tendency for temperature inversions, particularly during the cooler months. Köşk is surrounded by agricultural land, primarily dedicated to olive groves, fig orchards, and cotton fields – a typical landscape for this region of western Turkey. The proximity to the Aegean Sea, approximately 30 kilometers distant, introduces maritime influences, moderating temperatures but also potentially contributing to humidity and fog formation. While not heavily industrialized itself, Köşk’s location within the broader Aydın region, which experiences some industrial activity concentrated around Aydın city and Nazilli, means it can be affected by regional pollution transport. The urban-rural gradient is quite sharp; Köşk retains a distinctly rural character, but is increasingly influenced by the growth of nearby urban centres. This interplay between agricultural practices, regional industry, and meteorological conditions shapes the local air quality profile, making it susceptible to both locally generated and transported pollutants. The flat topography limits natural dispersion of pollutants.

Köşk’s air quality follows a distinct seasonal pattern. Spring (March-May) sees a rise in particulate matter due to agricultural activities – ploughing, sowing, and potential burning of agricultural waste. Gentle breezes can offer some relief, but stagnant conditions exacerbate pollution. Summers (June-August) generally experience better air quality, driven by stronger winds and higher temperatures promoting dispersion, though ozone levels can increase with intense sunlight. However, heatwaves can trap pollutants. Autumn (September-November) is often the most challenging period. The harvest season brings increased agricultural burning, combined with the onset of temperature inversions as temperatures drop, trapping pollutants near the ground. Fog, common during this time, further reduces visibility and concentrates pollutants. Winter (December-February) sees reduced agricultural activity, but heating with coal or wood in residential areas becomes a significant source of particulate matter. Calm, stable air masses are frequent, leading to prolonged periods of poor air quality. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit outdoor exertion during autumn and winter. Spring can also pose risks due to pollen and agricultural dust. Monitoring wind direction is crucial; winds from the industrial areas to the north and east can bring elevated pollution levels.