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Tbilisi, the capital of Georgia, is strategically situated in the South Caucasus region of West Asia, nestled within the narrow valley of the Mtkvari River. This urban center lies at an elevation of approximately 380-770 meters above sea level, creating a distinctive basin topography that profoundly influences its air quality. The city is surrounded by the Trialeti Range to the west, the Saguramo Range to the north, and the Iori Plateau to the southeast, forming a natural amphitheater that traps pollutants within the urban core. Tbilisi's position along the historic Silk Road has shaped its development as a transportation hub, with major highways converging in the valley, exacerbating vehicle emissions. The Mtkvari River flows through the city center, but its narrow width provides minimal dispersion effect for airborne contaminants. Industrial zones, including Soviet-era factories in the Didube and Nadzaladevi districts, cluster along the valley floor, while residential areas extend up the surrounding slopes. This urban-rural gradient sees cleaner air at higher elevations, but thermal inversions frequently occur in the basin, particularly during winter months, creating stagnant atmospheric conditions that concentrate pollutants from vehicles, industrial operations, construction activities, and residential heating systems. The city's geography as a constrained valley settlement fundamentally limits natural ventilation, making topographic factors as significant as emission sources in determining air quality outcomes.

Tbilisi's air quality follows a pronounced seasonal pattern shaped by its humid subtropical climate and topographic constraints. During winter (November-February), pollution reaches its peak as temperature inversions trap cold air in the valley, creating stagnant conditions that concentrate emissions from vehicle exhaust, industrial operations, and residential gas heating. These months feature frequent fog and low wind speeds, with December and January being particularly problematic for sensitive groups who should limit prolonged outdoor exposure. Spring (March-May) brings gradual improvement as increasing temperatures break up inversions and occasional rainfall helps cleanse the atmosphere, though construction dust becomes more noticeable during drier periods. Summer (June-August) offers the cleanest air despite higher temperatures, as thermal convection and more frequent breezes provide better dispersion, though ozone formation can occasionally be a concern on hot, sunny days. Autumn (September-October) sees a transitional period with generally good air quality until late October when heating season begins and atmospheric stability increases. Visitors with respiratory conditions should avoid extended outdoor activities during winter months, while spring and summer provide optimal conditions for exploring the city. The seasonal narrative is dominated by winter stagnation versus summer ventilation, with the basin topography amplifying these meteorological effects year-round.