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Borj Hammoud, nestled within the Mont-Liban Governorate of Lebanon, presents a complex urban geography profoundly influencing its air quality. Situated at coordinates 33.8936, 35.5403, the city occupies a relatively low-lying area, though with noticeable topographic variation as it rises towards the foothills of Mount Lebanon. This proximity to the mountains creates a bowl-like effect, potentially trapping pollutants during periods of atmospheric stability. Borj Hammoud is strategically positioned near Beirut, effectively functioning as an eastern extension of the capital’s urban sprawl. Historically, it served as an industrial zone, a legacy that continues to impact the area’s environmental profile. The Mediterranean Sea lies just a few kilometers to the west, offering some degree of coastal ventilation, but prevailing winds don’t consistently deliver this benefit. Surrounding the city are pockets of agricultural land, interspersed with increasingly dense residential development. The urban-rural gradient is rapidly diminishing, leading to increased vehicle traffic and construction activity. This combination of industrial heritage, dense population, limited natural ventilation, and encroaching urbanisation creates a challenging environment for maintaining clean air. The city’s location within a narrow coastal strip exacerbates the concentration of pollutants, particularly during periods of calm weather.

Borj Hammoud’s air quality follows a distinct seasonal pattern dictated by Lebanon’s Mediterranean climate. Summer (June-August) typically sees relatively better air quality, driven by prevailing sea breezes that offer some dispersion of pollutants, though high temperatures can promote ozone formation. However, increased tourism and traffic during this period can offset these benefits. Autumn (September-November) marks a transition, with decreasing temperatures and the onset of more stable atmospheric conditions, leading to a gradual increase in particulate matter. Winter (December-February) is often the most challenging period. Temperature inversions, common in the coastal region, trap pollutants close to the ground, exacerbated by increased heating fuel use. Rainfall is concentrated in winter, offering temporary relief, but can also wash pollutants into the soil. Spring (March-May) sees a gradual improvement as temperatures rise and winds become more frequent, but dust storms originating from the Syrian desert can significantly degrade air quality. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit outdoor activity during winter and periods of dust intrusion. Monitoring wind direction is crucial; winds from the east and southeast often carry dust, while those from the west bring cleaner air.