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Beirut, Lebanon's coastal capital, occupies a strategic position on the eastern Mediterranean, nestled between the Lebanon Mountains to the east and the sea to the west. This geography creates a distinct urban character where dense, historic neighbourhoods blend with modern high-rises along a narrow coastal plain. The city's location at 33.8981°N, 35.5058°E places it at the heart of West Asia, serving as a regional hub with significant maritime and air traffic. Terrain-wise, Beirut sits at low elevation near sea level, gradually rising towards foothills, which influences air circulation patterns. Proximity to the Mediterranean Sea moderates temperatures but also contributes to humidity that can trap pollutants. The surrounding landscape includes agricultural zones in the Bekaa Valley to the east and industrial areas in the southern suburbs, creating an urban–rural gradient where pollution sources converge. The Lebanon Mountains act as a partial barrier to easterly winds, sometimes causing stagnation over the city. This geographic setting, combined with dense urban development and vehicular emissions, creates a basin effect where pollutants accumulate, particularly during periods of low wind and temperature inversions, making Beirut's air quality highly sensitive to local meteorological conditions and urban activity patterns.

Beirut's air quality follows a distinct seasonal pattern shaped by Mediterranean climate influences. In winter (December-February), increased rainfall helps cleanse the air, though occasional temperature inversions can trap pollutants near the ground, particularly during calm, cold nights. Spring (March-May) brings variable conditions; while winds often improve dispersion, rising temperatures and reduced precipitation can allow particulate matter to accumulate, making late spring a period of moderate concern. Summer (June-August) typically sees the worst air quality due to intense sunlight driving ozone formation, combined with high traffic volumes and occasional dust storms from eastern deserts. This season demands caution for outdoor activities, especially for sensitive groups like children, elderly, and those with respiratory conditions who should limit exertion during peak afternoon hours. Autumn (September-November) offers relief as temperatures cool and sea breezes increase, though early autumn can still experience residual summer pollution. For health guidance, sensitive individuals should monitor local air quality reports year-round, use air purifiers indoors during high pollution episodes, and schedule outdoor activities for mornings when pollution levels are generally lower. The interplay of seasonal winds, temperature, and urban emissions creates a dynamic AQI story where summer peaks demand particular vigilance.