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Dastgerd, a small city nestled within the Eşfahān Province of Iran, occupies a geographically significant position within the central Iranian plateau. Located at approximately 32.8008° N, 51.6647° E, its coordinates place it within a semi-arid climate zone, characterized by limited precipitation and intense solar radiation. The city’s terrain is gently undulating, part of a broader alluvial plain formed by ancient river systems, now largely subterranean. Elevation sits around 1,585 meters (5,200 feet) above sea level, contributing to cooler temperatures compared to lower-lying regions, but also influencing atmospheric stability. Dastgerd’s proximity to Eşfahān, a major industrial and population hub, is a crucial factor in its air quality profile. The urban–rural gradient shifts rapidly; the city is surrounded by agricultural lands, primarily cultivating fruits and grains, which can contribute to seasonal particulate matter from agricultural practices like burning crop residue. To the east, the mountainous terrain of the Zagros range acts as a partial barrier, sometimes trapping pollutants, while prevailing winds from the northwest can occasionally provide some dispersion. The lack of significant surface water bodies nearby limits natural air purification processes. The region’s geology, dominated by sedimentary rocks, also influences dust generation, particularly during dry periods. The city’s relatively small size doesn’t diminish the impact of regional pollution sources, making it susceptible to transboundary air pollution events originating from industrial zones and larger urban centers.

Dastgerd’s air quality experiences a distinct seasonal cycle heavily influenced by 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. This, combined with reduced wind speeds, results in prolonged periods of stagnant air and elevated particulate matter. Dust storms, originating from the surrounding deserts, are also more frequent during winter months. Spring (March-May) brings a gradual improvement as temperatures rise and wind speeds increase, aiding in pollutant dispersion. However, agricultural burning, a common practice for land clearing and residue disposal, can temporarily degrade air quality during this transition period. Summers (June-August) are generally the most favorable, with higher temperatures promoting atmospheric stability and increased wind speeds, which help to dilute pollutants. However, intense heat can exacerbate ozone formation under certain conditions. Autumn (September-November) sees a return to more variable conditions. As temperatures cool, the risk of temperature inversions increases again, and dust events can persist. The best months for outdoor activity are typically June, July, and August, when wind patterns are generally more consistent and pollutant concentrations tend to be lower. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during winter months and be aware of potential agricultural burning events in spring. Staying indoors during dust storms and avoiding strenuous outdoor activity during periods of stagnant air are recommended.