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Hafshejān, nestled within the Chahār Maḩāl va Bakhtīārī province of Iran, occupies a geographically complex position at approximately 32.2253° N, 50.7961° E. The city’s terrain is characterized by a gradual transition from the Zagros Mountains foothills to the alluvial plains of the Dez River basin. This elevation, averaging around 1,550 meters (5,085 feet) above sea level, significantly influences local weather patterns and, consequently, air quality. Hafshejān sits within a region dominated by semi-arid to arid climates, with sparse vegetation primarily consisting of drought-resistant shrubs and grasses. The surrounding landscape is a mosaic of agricultural lands – predominantly wheat and barley cultivation – interspersed with scattered orchards and grazing pastures. To the west, the imposing presence of the Zagros Mountains creates a barrier, often trapping pollutants and contributing to temperature inversions, particularly during colder months. The Dez River, while providing a vital water source, also influences humidity levels and can, under certain conditions, exacerbate particulate matter dispersion. Hafshejān’s urban footprint is relatively small, exhibiting a clear urban–rural gradient as it expands outwards. While industrial activity is limited within the city itself, the proximity to larger regional industrial zones and agricultural practices involving burning contribute to external pollution sources. The city’s location within a basin further restricts air circulation, making it susceptible to the accumulation of pollutants, especially during periods of low wind speed.

Hafshejān’s air quality experiences a distinct seasonal cycle dictated by its climate and regional weather patterns. Winters (December-February) are typically the most challenging period. Cold air masses settling in the basin frequently lead to strong temperature inversions, where a layer of warm air traps cooler air near the ground, preventing vertical mixing and concentrating pollutants. Agricultural burning, a common practice for clearing fields after harvest, significantly contributes to particulate matter during this time. Spring (March-May) brings a gradual improvement as temperatures rise and wind speeds increase, dispersing accumulated pollutants. However, dust storms originating from the surrounding deserts can occasionally impact air quality. Summers (June-August) are generally characterized by drier conditions and higher temperatures, which can exacerbate ozone formation, though the relatively low population density mitigates this somewhat. The intense heat also reduces the density of the air, potentially affecting pollutant dispersion. Autumn (September-November) sees a return to more stable atmospheric conditions, with a gradual increase in agricultural burning as farmers prepare for the next planting season. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during winter months, limiting outdoor activities on days with stagnant air. During spring, monitoring local weather reports for dust storm warnings is crucial. Maintaining indoor air quality through proper ventilation and air filtration can provide relief during periods of elevated pollution.