Nubl, a city in the Ḩalab Governorate of Syria, occupies a strategically significant position within the Orontes River valley. Located at coordinates 36.3787°N, 36.9929°E, the city sits at an elevation of approximately 300 meters above sea level, nestled amidst gently rolling hills transitioning into the broader Syrian steppe. This terrain influences air quality by limiting atmospheric dispersion, particularly during periods of calm weather. The Orontes River, flowing nearby, provides a crucial water source but also contributes to localized humidity, potentially exacerbating particulate matter issues. Historically an agricultural hub, the surrounding lands are dominated by olive groves, wheat fields, and fruit orchards. However, the prolonged Syrian Civil War has dramatically altered land use, with reports of increased informal settlements and disrupted agricultural practices. The urban-rural gradient is blurred by the conflict, with refugee influxes placing strain on Nubl’s infrastructure. The city’s proximity to Aleppo, a major industrial centre, means it is susceptible to transboundary pollution, particularly during unfavourable wind conditions. Dust storms originating from the Syrian Desert and neighbouring regions also significantly impact air quality, depositing fine particulate matter. The city’s compact urban form, typical of many Syrian settlements, further concentrates pollutants.

Nubl experiences a Mediterranean climate with hot, dry summers and cool, wet winters. Air quality in Nubl is markedly seasonal. Summer (June-August) often sees elevated ozone levels due to intense sunlight and high temperatures reacting with vehicle emissions and industrial byproducts, though conflict-related disruption limits industrial output. Dust storms are also prevalent during these months, originating from the Syrian Desert and impacting visibility and respiratory health. Autumn (September-November) brings a temporary improvement as cooler temperatures reduce ozone formation and rainfall helps to cleanse the atmosphere. However, increased burning of agricultural waste after harvest can lead to localised spikes in particulate matter. Winter (December-February) is characterised by cooler, wetter conditions, generally offering better air quality, though temperature inversions can trap pollutants near the ground, especially in calm conditions. Spring (March-May) sees a gradual warming and increased agricultural activity, potentially leading to a rise in dust and pollen levels. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit outdoor exertion during summer dust storms and periods of temperature inversion in winter. Monitoring wind direction is crucial; winds from the desert will bring poorer air quality.