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Aleppo, Syria's largest city, occupies a strategic position in northwestern Syria's fertile Aleppo Plateau at approximately 380 meters above sea level. This ancient urban center sits within a semi-arid basin surrounded by limestone hills to the west and agricultural plains extending eastward toward the Euphrates River valley. The city's geography creates a natural amphitheater effect that traps air pollutants, particularly given its inland location far from major bodies of water that might provide cleansing sea breezes. Aleppo's urban character reflects centuries of layered development, with dense historic quarters surrounded by sprawling modern suburbs and industrial zones concentrated primarily to the northeast along transportation corridors. The city serves as the commercial and industrial hub for northern Syria, with manufacturing facilities, textile mills, and food processing plants contributing to urban emissions. Surrounding agricultural lands produce wheat, cotton, and pistachios, with seasonal burning occasionally adding to particulate matter. The urban-rural gradient shows decreasing pollution levels moving westward toward the Mediterranean coast, though prevailing westerly winds often carry pollutants from coastal industrial areas inland toward Aleppo. The city's elevation provides some relief from extreme heat but insufficient to prevent temperature inversions that frequently occur during calm winter nights, trapping vehicle emissions and residential heating pollutants in the basin.

Aleppo's air quality follows distinct seasonal patterns shaped by its Mediterranean-influenced semi-arid climate. Winter months (December-February) typically see the poorest air quality as temperature inversions trap pollutants from heating sources (primarily diesel and wood) close to the ground, with calm winds and frequent fog exacerbating particulate accumulation. Sensitive groups should limit outdoor activity during morning hours when inversions are strongest. Spring (March-May) brings improving conditions as increased wind speeds disperse pollutants, though occasional dust storms from the Syrian Desert can temporarily spike particulate levels. This season offers the most favorable conditions for outdoor activities. Summer (June-August) features high temperatures and intense sunlight that accelerate photochemical reactions, creating ground-level ozone from vehicle emissions, though stronger daytime winds provide some ventilation. Early mornings remain best for exercise to avoid peak ozone formation. Autumn (September-November) sees a gradual deterioration as winds decrease and temperature inversions return, with agricultural burning occasionally contributing to haze. The transition months of October and November typically mark the beginning of the high pollution season that peaks in January. Year-round, sensitive individuals should monitor days with visible haze or calm conditions and consider indoor air filtration during peak pollution periods.