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Büyükçekmece occupies a distinctive position within Istanbul's metropolitan expanse, situated along the northern shore of the eponymous Büyükçekmece Lake where it meets the Sea of Marmara. This coastal district lies approximately 35 kilometres west of Istanbul's historic core, positioned within the broader Thracian region of northwestern Turkey. The terrain here is characterized by gently rolling hills typical of the Marmara region, with elevations generally ranging from sea level to about 50 metres, creating a subtle but meaningful topographic variation that influences local air circulation patterns. Büyükçekmece's geography creates a unique urban-rural gradient where dense residential developments transition toward agricultural zones and natural preserves, particularly to the north and west. The district's proximity to both freshwater and marine environments creates microclimatic effects, with the lake and sea acting as moderating influences on temperature extremes while occasionally contributing to humidity-driven pollution retention. Büyükçekmece sits within Istanbul's expanding western development corridor, where urbanization meets remaining agricultural land, creating a complex mosaic of pollution sources. The district's position along major transportation arteries connecting Istanbul to Thrace and Europe means it experiences significant vehicular emissions, while its industrial zones—particularly those focused on manufacturing and logistics—contribute to the area's particulate matter burden. The surrounding landscape, with hills to the north and water bodies to the south, can create localized air stagnation under certain meteorological conditions, particularly when winds from the northeast are weak.

Büyükçekmece experiences distinct seasonal air quality patterns shaped by its Marmara climate and urban geography. During winter, from December through February, pollution typically peaks due to increased residential heating emissions combining with frequent temperature inversions that trap pollutants near the surface. Cold air settling in the district's topographic depressions, combined with weak northeasterly winds, creates persistent haze episodes that particularly affect those with respiratory conditions. Spring brings gradual improvement as increasing solar radiation strengthens atmospheric mixing, though March and April can still experience pollution spikes during anticyclonic conditions with light winds. The transitional nature of spring weather means sensitive groups should monitor daily forecasts for sudden changes. Summer months, from June through August, generally offer better air quality due to stronger sea breezes from the Marmara that disperse pollutants, though occasional heatwaves in July and August can elevate ground-level ozone when intense sunlight reacts with precursor emissions. Autumn presents the most variable conditions, with September often maintaining summer's cleaner air while October and November see deteriorating conditions as heating season begins and stagnant high-pressure systems become more frequent. Throughout the year, sensitive individuals—including children, elderly residents, and those with asthma or cardiovascular conditions—should limit strenuous outdoor activity during morning hours when pollution concentrations are typically highest, and pay particular attention to air quality advisories during winter inversion episodes and summer ozone alerts.