Loading air quality context...

Sarakhs, situated in the Khorāsān-e Raẕavī province of Iran, occupies a geographically significant position along the ancient Silk Road. The city lies at an elevation of approximately 920 meters (3,018 feet) amidst a semi-arid landscape, transitioning towards the foothills of the Kopet Dag mountains to the north. This terrain influences local wind patterns and contributes to the potential for temperature inversions, trapping pollutants. The terrain is largely flat, consisting of plains and alluvial fans, with limited natural barriers to disperse airborne particles. The Kashaf River flows nearby, but its contribution to local humidity is limited, and it doesn’t significantly mitigate dust events. Sarakhs functions as a border city, with Turkmenistan to the east, fostering cross-border trade and transport, which contributes to vehicular emissions. The surrounding area is predominantly agricultural, with wheat and other crops cultivated, and some livestock farming. This agricultural activity can generate dust and ammonia emissions. The urban-rural gradient is relatively sharp, with the city centre densely populated and transitioning quickly to agricultural lands. The city’s location within a basin-like structure, combined with prevailing wind directions, exacerbates the accumulation of pollutants, particularly during stable atmospheric conditions. This geographical setting is a key determinant of Sarakhs’ air quality challenges.

Sarakhs experiences a continental climate with hot, dry summers and cold winters. Air quality in Sarakhs is markedly seasonal. Spring (March-May) often sees a deterioration in air quality due to dust storms originating from the arid regions to the west and south, exacerbated by strong winds. These ‘khamsin’ winds carry significant particulate matter. Summer (June-August) brings intense heat and stable atmospheric conditions, leading to the build-up of ozone and other secondary pollutants from vehicle emissions and industrial activity. While winds are generally weaker, temperature inversions are common, trapping pollutants near the ground. Autumn (September-November) offers a brief respite with cooler temperatures and increased precipitation, helping to wash away some pollutants. However, agricultural burning of crop residue during harvest season can contribute to localised smoke and particulate matter. Winter (December-February) is characterised by cold temperatures and frequent temperature inversions, trapping pollutants from domestic heating – primarily wood and coal burning – and vehicle exhaust. Sensitive groups, including children, the elderly, and those with respiratory conditions, should limit outdoor activity during spring dust storms and winter heating seasons. Months of July and August are particularly challenging due to ozone formation. Monitoring wind patterns and avoiding peak pollution times are crucial for protecting public health.