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Gonbad-e Kāvūs, nestled in the Golestān province of northern Iran, occupies a geographically significant position at the edge of the Dasht-e Gorgan plain, a vast expanse of fertile land bordering the Caspian Sea. Its coordinates (37.2436, 55.1658) place it at an elevation of approximately 235 meters above sea level, contributing to a relatively mild climate compared to higher-altitude regions of Iran. The city’s urban character is a blend of traditional Persian architecture and modern development, reflecting its historical role as a significant trading hub along ancient Silk Road routes. The surrounding landscape is dominated by agricultural fields – primarily wheat, barley, and cotton – interspersed with scattered villages and orchards. To the north lies the Gorgan plain, gradually sloping towards the Caspian Sea, while the southern periphery transitions into more arid steppe terrain. This proximity to extensive agricultural zones introduces a seasonal element to air quality, with dust and agricultural burning contributing to particulate matter during harvest periods. The urban–rural gradient is relatively gradual, with agricultural activities influencing air quality even within the city limits. The city’s location, while benefiting from some sea breezes from the Caspian, also experiences periods of stagnant air, particularly during temperature inversions common in winter. Industrial activity is limited, primarily focused on food processing and textile manufacturing, but the sheer scale of agricultural operations and the potential for transboundary dust events from Central Asia significantly impact the local air quality profile.

Gonbad-e Kāvūs experiences a distinct seasonal pattern in its air quality, largely dictated by meteorological conditions and agricultural practices. Winters (December-February) are typically the most challenging, characterized by cold temperatures and frequent temperature inversions. These inversions trap pollutants near the ground, leading to periods of reduced visibility and elevated concentrations of particulate matter. The lack of strong winds during this period exacerbates the problem. Spring (March-May) brings a gradual improvement as temperatures rise and winds become more frequent, dispersing pollutants. However, the spring also coincides with the start of the agricultural season, and controlled burns of crop residue can contribute to localized air pollution episodes. Summers (June-August) are generally the most favorable period, with warm temperatures, consistent winds, and relatively low humidity. The Caspian Sea breezes play a crucial role in ventilating the city. Autumn (September-November) sees a return to more variable conditions. Harvest season brings increased agricultural burning, and dust storms originating from Central Asia can impact air quality, particularly in October and November. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during winter months and be mindful of agricultural burning in spring and autumn. Outdoor activities are generally best enjoyed during the summer months when ventilation is optimal. Avoiding strenuous activity during periods of reduced visibility is advisable, and wearing a mask can provide some protection against particulate matter.