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Khwansār, nestled within the Eşfahān Province of Iran, occupies a geographically significant position at approximately 33.22°N, 50.31°E. The city’s terrain is characterized by a gently sloping plain, part of the broader Iranian Plateau, situated at an elevation of roughly 1,650 meters (5,413 feet) above sea level. This altitude contributes to cooler temperatures compared to lower-lying regions, but also influences atmospheric stability, a key factor in air quality. Khvānsār lies within a semi-arid climate zone, bordered by the central Iranian desert to the east and the more fertile lands of the Eşfahān plain to the west. The surrounding landscape is a mosaic of agricultural fields – primarily cultivating wheat, barley, and fruits – interspersed with scattered villages and traditional qanats (underground channels for water conveyance). The proximity to Eşfahān, a major industrial and urban hub, is crucial; Khvānsār experiences a gradual urban–rural gradient, with increasing influence from Eşfahān’s industrial emissions and vehicular traffic as one approaches the provincial capital. While not directly adjacent to major rivers, the region relies on groundwater and seasonal streams, impacting local humidity levels. The prevailing winds, often originating from the northwest, can transport pollutants from Eşfahān and other industrial areas, impacting Khvānsār’s air quality. The relatively flat topography limits dispersion, particularly during periods of calm weather, exacerbating the effects of regional pollution sources and local agricultural practices like burning crop residue.

Khwansār’s air quality follows a distinct seasonal pattern dictated by its climate and regional influences. Winters (December-February) are typically the most challenging period. Cold temperatures frequently lead to temperature inversions, where a layer of warm air traps cooler air near the ground, preventing vertical mixing and concentrating pollutants. The lack of strong winds during these months further compounds the issue, allowing particulate matter and other emissions to accumulate. Agricultural burning, a common practice for clearing fields after harvest, significantly contributes to winter pollution episodes. Spring (March-May) brings a gradual improvement as temperatures rise and winds increase, dispersing pollutants more effectively. However, dust storms originating from the central Iranian deserts can occasionally impact air quality, introducing large quantities of particulate matter. Summers (June-August) are generally the cleanest period, characterized by higher temperatures, stronger winds, and increased convective mixing, which helps to dilute pollutants. However, intense heat can exacerbate the effects of ozone precursors. Autumn (September-November) sees a return to more stable atmospheric conditions, with a gradual increase in pollution levels as temperatures cool and agricultural burning resumes. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during winter months and be mindful of dust storm warnings in spring. Limiting outdoor exertion during periods of stagnant air and avoiding areas near agricultural fields during burning season are advisable.