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Qabb Eliâs, nestled within the fertile Béqaa Valley of Lebanon, occupies a geographically complex position significantly influencing its air quality. Located at approximately 33.7986° N, 35.8250° E and an elevation of around 950 meters above sea level, the city benefits from the valley’s agricultural productivity but also faces unique environmental challenges. The Béqaa Valley itself is a longitudinal depression, bordered by the Lebanon Mountains to the west and the Anti-Lebanon Mountains to the east, creating a natural basin. This topography often traps pollutants, particularly during periods of low wind. Qabb Eliâs sits within a predominantly rural landscape, characterized by extensive orchards (apples, cherries, olives) and agricultural fields, contributing to seasonal biomass burning and fugitive dust emissions. While not directly adjacent to a major river, the Orontes River flows nearby, impacting regional humidity and potentially influencing atmospheric stability. The urban–rural gradient is relatively sharp; Qabb Eliâs transitions quickly from residential areas to agricultural land. The city’s proximity to the Beirut-Damascus highway, a major transportation corridor, introduces vehicular emissions. Furthermore, the region's history of conflict and subsequent reconstruction has left a legacy of potential contamination from unexploded ordnance and demolition debris, which can become airborne. The surrounding Anti-Lebanon range can also act as a barrier, hindering the dispersion of pollutants and exacerbating local air quality issues. The valley’s climate, characterized by hot, dry summers and cool, wet winters, further complicates the atmospheric dynamics affecting air quality.

Qabb Eliâs experiences a distinct seasonal cycle impacting air quality. Spring (March-May) sees a gradual improvement as temperatures rise and rainfall decreases, though agricultural burning for land clearing can still contribute to particulate matter. Summer (June-August) is typically the most challenging period. High temperatures and prolonged periods of sunshine create stable atmospheric conditions, frequently leading to temperature inversions where a layer of warm air traps cooler air and pollutants near the ground. Winds are often light and variable, further hindering dispersion. Dust storms, originating from the Syrian Desert to the east, can also significantly degrade air quality during this season. Autumn (September-November) brings a slight improvement as winds increase and temperatures cool, but agricultural activities, including harvesting and post-harvest processing, can generate localized pollution. Winter (December-February) is generally the cleanest season, with increased rainfall washing pollutants from the atmosphere and stronger winds aiding dispersion. However, periods of fog, common during winter, can trap pollutants, creating localized episodes of poor air quality. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should limit outdoor exertion during the summer months, particularly during midday when temperatures are highest and inversions are most likely. Agricultural workers should be mindful of exposure to pesticides and dust during harvest seasons. Maintaining indoor air quality through ventilation and air purification can also be beneficial, especially during periods of elevated pollution.