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Īrānshahr, nestled within the Sīstān va Balūchestān province of southeastern Iran, occupies a geographically challenging and distinctive position. Located at approximately 27.1978° N, 60.6836° E, the city sits at an elevation of roughly 550 meters (1800 feet) above sea level, within a vast expanse of arid and semi-arid plains. The surrounding landscape is dominated by the Lut Desert, a UNESCO World Heritage site known for its dramatic yardangs and extreme temperatures, and the Hamūn wetlands to the north, though the latter’s condition has fluctuated significantly over time. This proximity to both desert and wetland creates a complex interplay of microclimates. The urban character of Īrānshahr is relatively modern, reflecting its growth as a regional trade and administrative hub. The city’s development has been influenced by its role as a gateway to Afghanistan and Pakistan. The urban–rural gradient transitions rapidly from the city center to sparsely populated agricultural areas, primarily focused on date palm cultivation and limited rain-fed farming. Industrial activity is limited, primarily consisting of small-scale workshops and processing facilities related to agriculture. The prevailing winds, often originating from the Lut Desert, carry dust and sand, significantly impacting air quality. The lack of substantial bodies of water nearby, coupled with the desert’s influence, contributes to a dry climate and limited atmospheric moisture, exacerbating the effects of any local pollution sources and hindering pollutant dispersion. The terrain, generally flat with some low hills, doesn't offer significant natural ventilation.

Īrānshahr’s air quality experiences a pronounced seasonal cycle dictated by its arid climate and regional weather patterns. The dry season, spanning from late spring through autumn (roughly April to November), is characterized by consistently high temperatures and minimal rainfall. This period witnesses the most significant air quality challenges. Strong, hot winds blowing from the Lut Desert frequently carry large quantities of dust and sand, dramatically reducing visibility and increasing particulate matter concentrations. Temperature inversions, common during calmer periods in late autumn and early winter, trap pollutants near the ground, further degrading air quality. The winter months (December to March) offer a slight respite, with cooler temperatures and occasional, light rainfall. However, fog events, particularly in December and January, can also trap pollutants, creating localized episodes of poor air quality. Spring (March-May) brings a gradual increase in temperatures and wind activity, with dust storms becoming more frequent as the desert surface dries out. Agricultural activities, including burning of crop residues after harvest, can contribute to localized pollution spikes during this transition period. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the dry season, limiting outdoor activities during peak dust storm periods and avoiding strenuous exertion. Maintaining indoor air quality through filtration and ventilation is crucial during these times. The infrequent rainfall provides temporary cleansing of the atmosphere, but its impact is often short-lived.