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Hajīn, situated in the Dayr az Zawr Governorate of Syria, occupies a critical position within the Euphrates River valley. Located at approximately 34.6951°N, 40.8314°E, the city’s geography is dominated by the arid and semi-arid landscapes characteristic of the Syrian Desert. The terrain is largely flat, transitioning to undulating plains closer to the river, with an elevation generally below 200 meters. The Euphrates River is the defining geographical feature, providing a vital water source but also influencing local microclimates and potentially concentrating pollutants during periods of low flow. Hajīn’s urban character is shaped by its role as a regional market town, serving surrounding agricultural communities. The surrounding landscape is predominantly agricultural, focused on date palm cultivation and cereal farming, alongside vast stretches of desert. The urban-rural gradient is relatively sharp, with a rapid transition from densely populated areas to sparsely inhabited agricultural lands and then to open desert. This proximity to agricultural zones introduces potential sources of dust and pesticide drift, while the desert environment contributes to frequent dust storms. The city’s location within a conflict zone has severely impacted infrastructure, including waste management and industrial controls, exacerbating air quality challenges. The prevailing winds, generally from the northwest, can transport pollutants across the region, impacting air quality in Hajīn.

Hajīn experiences a harsh desert climate with significant seasonal variations in air quality. Summers (June-August) bring intense heat and dry conditions, coupled with frequent dust storms originating from the surrounding desert. These storms dramatically increase particulate matter concentrations, posing a significant respiratory hazard. Winter (December-February) offers some respite from dust, but temperature inversions become common, trapping pollutants near the ground, particularly those from domestic heating using wood and other biomass. Spring (March-May) sees a temporary improvement as rainfall washes away accumulated pollutants, but agricultural activities begin to ramp up, potentially releasing pesticides and ammonia. Autumn (September-November) is generally the clearest period, with moderate temperatures and less wind, but the burning of agricultural residue after harvest can lead to localised spikes in pollution. Sensitive groups – children, the elderly, and those with pre-existing respiratory conditions – should avoid strenuous outdoor activity during summer dust storms and winter temperature inversions. The months of October and November typically offer the most favourable conditions for outdoor activity. Monitoring wind direction is crucial; winds from the northwest are likely to carry pollutants from upstream sources. The ongoing conflict and displacement contribute to inconsistent waste management, further degrading air quality throughout the year.