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Beylikdüzü occupies a distinctive position within Istanbul's sprawling metropolitan fabric, situated on the European side of Turkey along the northern coast of the Sea of Marmara. This district lies approximately 35 kilometres west of Istanbul's historic core, positioned on relatively flat terrain with an average elevation of around 50 metres above sea level, though it gently slopes toward the Marmara coastline to the south. Beylikdüzü's geography places it within Istanbul's expanding western urban corridor, characterized by rapid residential development that has transformed former agricultural lands into dense apartment complexes and commercial zones. The district's proximity to the TEM highway and its location along major transportation arteries connecting Istanbul to Thrace and Europe means it experiences significant vehicular emissions, compounded by its position downwind of industrial zones in nearby Avcılar and Esenyurt. While the Sea of Marmara provides some moderating influence on local temperatures, Beylikdüzü's inland position relative to the coast means it receives less direct maritime ventilation than districts immediately along the shoreline. The urban-rural gradient here is particularly steep, with Beylikdüzü's western edges transitioning abruptly to less developed areas, though this boundary continues to shift with ongoing construction. This geography creates a complex air quality scenario where local emissions from transportation and heating systems interact with regional pollution transported from Istanbul's industrial western districts, often trapped by the area's topography during atmospheric inversions.

Beylikdüzü's air quality follows distinct seasonal patterns shaped by Istanbul's transitional climate between Mediterranean and oceanic influences. During winter months from December through February, pollution typically peaks due to increased residential heating emissions from coal and natural gas, combined with frequent temperature inversions that trap pollutants near the surface. These cold, stagnant conditions are exacerbated by reduced wind speeds and occasional fog, creating hazardous conditions particularly for children, elderly residents, and those with respiratory conditions who should limit prolonged outdoor exposure. Spring brings gradual improvement as temperatures rise and precipitation increases, with March and April experiencing more frequent rainfall that helps cleanse the atmosphere, though pollen from the district's numerous parks and green spaces can trigger allergies. Summer months from June through August generally offer the cleanest air, with consistent northeasterly winds (the 'Poyraz') providing ventilation from the Black Sea, dispersing local pollutants and making this the optimal season for outdoor activities. However, occasional heatwaves can lead to ozone formation from vehicle emissions reacting with sunlight. Autumn sees a gradual deterioration in air quality from October onward as heating season begins and atmospheric stability increases, with November often marking the transition to winter pollution patterns. Sensitive groups should monitor air quality forecasts particularly during seasonal transitions and consider indoor air purification during peak pollution periods.