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Athens, the capital of Greece, is situated in the Attica Basin, a coastal plain surrounded by mountains on three sides—Mount Aigaleo to the west, Mount Parnitha to the north, and Mount Hymettus to the east—with the Saronic Gulf to the south. This unique topography creates a natural bowl that traps air pollutants, exacerbating urban air quality issues. The city's elevation ranges from sea level along the coastline to approximately 300 meters in northern suburbs, with the urban core densely built and extending into the surrounding foothills. Athens lies within the Attica region, which includes industrial zones in Thriasio Plain to the west and Elefsina, contributing to pollution through manufacturing and shipping activities. The urban-rural gradient is sharp, with agricultural areas in Mesogeia to the east and rural hinterlands in the mountains. Proximity to the Mediterranean Sea moderates temperatures but does little to disperse pollutants due to weak prevailing winds, often leading to stagnant air conditions. The city's location in a seismically active zone has influenced its compact, high-density urban form, further concentrating emissions from traffic and residential heating. This geographic setting, combined with intense urbanization, makes Athens particularly vulnerable to air pollution episodes, especially during periods of atmospheric stability.

In Athens, air quality varies significantly across seasons due to meteorological patterns and human activities. Winter, particularly from November to February, sees the worst pollution, driven by increased use of wood-burning heaters and vehicular emissions, coupled with frequent temperature inversions that trap pollutants in the Attica Basin. Cold, stagnant air and low wind speeds exacerbate particulate matter and nitrogen dioxide levels, making this period hazardous for sensitive groups like children, the elderly, and those with respiratory conditions. Spring, from March to May, brings gradual improvement as temperatures rise and rainfall increases, helping to cleanse the air, though occasional Saharan dust events can temporarily spike particulate levels. Summer, from June to August, features high ozone pollution due to intense sunlight and heat, with peak levels in July and August; sea breezes offer some relief but often recirculate pollutants within the basin. Autumn, from September to October, typically has the best air quality, with milder temperatures and more frequent winds dispersing emissions. For outdoor activities, autumn is ideal, while winter should be avoided by sensitive individuals, who are advised to limit exposure during high-pollution days, use air purifiers indoors, and monitor local air quality alerts year-round.