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Qā’emīyeh, nestled within the Fars Province of Iran, occupies a strategically important location at approximately 29.85°N, 51.58°E. The city’s geography is defined by its position on the southern fringes of the Zagros Mountains, a significant orographic barrier influencing regional weather patterns and air circulation. Situated at an elevation of roughly 1,550 meters (5,085 feet) above sea level, Qā’emīyeh enjoys a relatively cool climate compared to lower-lying areas of Fars. The surrounding landscape is a mosaic of semi-arid plains gradually transitioning into the rugged foothills of the Zagros. To the south and east, agricultural lands, primarily cultivating fruits and grains, extend towards the Dasht-e Arjan plain. This proximity to agricultural zones introduces potential sources of particulate matter, particularly during harvest seasons when burning of crop residues can occur. The city’s urban character is that of a smaller regional hub, serving as a market town for surrounding rural communities. While industrial activity is limited within Qā’emīyeh itself, it benefits from its proximity to larger industrial belts located further west, towards Shiraz. The urban-rural gradient is relatively sharp, with the city quickly giving way to agricultural fields and then the mountainous terrain. The Zagros Mountains play a crucial role in trapping pollutants, especially during periods of low wind, leading to localized air quality challenges. The lack of significant bodies of water nearby further limits natural air cleansing mechanisms, making the city’s air quality highly susceptible to regional weather conditions and anthropogenic emissions.

Qā’emīyeh’s air quality experiences a distinct seasonal cycle heavily influenced by its climate and topography. Winters (roughly November to February) are typically the most challenging period. Cold air masses descending from the Zagros Mountains frequently lead to temperature inversions, where a layer of warm air traps cooler air near the ground, preventing vertical mixing and concentrating pollutants. This is exacerbated by reduced sunlight hours and calmer wind conditions, hindering pollutant dispersal. Agricultural burning, a common practice for land clearing and residue disposal, also contributes significantly to particulate matter during this time. Spring (March to May) brings a gradual improvement as temperatures rise, and winds increase, aiding in the dispersion of pollutants. However, dust storms originating from the central Iranian deserts can occasionally impact air quality. Summers (June to August) are generally the most favorable period, with higher temperatures promoting atmospheric stability and increased wind speeds, effectively clearing the air. However, intense heat can contribute to the formation of ground-level ozone. Autumn (September to October) sees a transition period, with decreasing temperatures and increasing wind speeds, but also a resurgence of agricultural burning as farmers prepare fields for the next planting season. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during winter months and be mindful of potential dust events in spring. Outdoor activities are generally best enjoyed during the summer months, but vigilance regarding ozone levels is advised.