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Körfez, situated in Kocaeli Province, Turkey, occupies a critical geographic position within the rapidly urbanizing İzmit Bay area. Located at approximately 40.7833°N, 29.7333°E, the city’s terrain is characterized by a coastal plain transitioning into the undulating hills of the Samanlı Mountains to the south. This proximity to both the Sea of Marmara and the mountainous interior significantly influences local air quality. Körfez is a key industrial hub, part of a larger industrial belt stretching along the northern coast of the Sea of Marmara, heavily focused on petrochemicals, automotive, and manufacturing. This concentration of industry is a primary driver of pollution. The urban-rural gradient is steep; immediately surrounding the city are agricultural lands, but these quickly give way to dense industrial zones and then to more sparsely populated, forested hills. The bay’s relatively shallow waters and limited circulation can exacerbate pollution events, trapping emissions. Prevailing winds generally flow from the northwest, carrying pollutants from Istanbul and other industrial areas, while local emissions are dispersed depending on weather patterns. The city’s elevation is low, increasing susceptibility to temperature inversions, which trap pollutants near ground level. This combination of factors makes Körfez particularly vulnerable to air quality challenges.

Körfez experiences a Mediterranean climate with hot, dry summers and cool, wet winters, profoundly impacting air quality. Pollution typically peaks during the late autumn and winter months (November to February). Reduced sunlight hours and frequent temperature inversions trap emissions from heating systems and industrial activity, leading to stagnant air conditions. Weak winds during this period further exacerbate the problem. Spring (March-May) sees a gradual improvement as temperatures rise and winds become more frequent, dispersing pollutants. However, agricultural burning can contribute to localized spikes in particulate matter. Summer (June-August) generally offers the best air quality, with strong sea breezes flushing out pollutants, despite increased vehicle traffic due to tourism. However, high ozone levels can form under intense sunlight. September and October represent a transitional period, with decreasing temperatures and increasing industrial activity leading to a gradual decline in air quality. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit strenuous outdoor activity during the winter months and be mindful of ozone levels during summer afternoons. Monitoring local conditions and following health advisories is crucial.