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Kharv-e Soflá, nestled within the Khorāsān-e Raẕavī province of Iran, occupies a geographically significant position on the eastern edge of the country, bordering Afghanistan. Located at approximately 36.1422° N, 59.0158° E, the city’s terrain is characterized by a gently sloping alluvial plain, a consequence of the seasonal Harirud River’s deposition. This river, originating in the Hindu Kush mountains, provides a vital, albeit intermittent, source of water for the region. Kharv-e Soflá sits at an elevation of roughly 600 meters (1,969 feet) above sea level, contributing to a generally drier climate and influencing atmospheric stability. The surrounding landscape is a mosaic of agricultural fields – primarily wheat and barley cultivation – interspersed with sparse vegetation typical of semi-arid environments. The urban–rural gradient transitions rapidly, with small villages and scattered settlements dominating the immediate periphery. Further afield, the landscape rises towards the Binalud Mountains, a significant geological feature impacting regional wind patterns. While not directly adjacent to a major body of water, the Harirud’s presence and the potential for groundwater extraction shape local hydrology. The region’s proximity to industrial zones in larger cities like Mashhad, coupled with agricultural practices involving burning of crop residues, contributes to localized air quality challenges. The relatively flat terrain can exacerbate pollution accumulation, particularly during periods of low wind speed, hindering effective dispersion of pollutants. The city’s location within a broad, relatively enclosed basin further compounds this effect.

Kharv-e Soflá’s air quality experiences a distinct seasonal cycle dictated by its climate and regional meteorological patterns. Winters (December-February) are typically the most challenging period. Cold air masses frequently settle over the region, leading to temperature inversions – a phenomenon where a layer of warm air traps cooler air near the ground, preventing vertical mixing and concentrating pollutants. Fog, common during these months, further reduces visibility and exacerbates the issue by trapping particulate matter. Agricultural burning, a traditional practice for clearing fields after harvest, intensifies during late autumn and early winter, adding significantly to the particulate load. Spring (March-May) brings a gradual improvement as temperatures rise and wind speeds increase, aiding in pollutant dispersal. However, dust storms originating from the central Asian deserts can occasionally impact air quality, introducing coarse particulate matter. Summers (June-August) are generally drier and hotter, with more frequent wind events that help to ventilate the atmosphere. However, high temperatures can contribute to the formation of ground-level ozone, a secondary pollutant. Autumn (September-November) sees a return to more stable atmospheric conditions, with a gradual decline in air quality as temperatures cool and the potential for agricultural burning increases. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during winter months and be mindful of dust storm advisories in spring. Limiting outdoor exertion during periods of reduced visibility and elevated particulate matter is advisable.